I replaced three toilets in my home over the last two years, and each one taught me something new about what separates a great toilet installation kit from a frustrating one. After wrestling with leaks, wobbly bases, and a few too many trips to the hardware store, our team decided to put the top toilet installation kits for bathrooms head to head. We tested each one on a real install, measured seal strength, timed the work, and noted every frustration along the way.
If you are replacing a toilet, reseating a wobbly one, or rebuilding a leaking tank, the right kit makes the difference between a Saturday afternoon project and a weekend you would rather forget. In this guide, I share the seven best toilet installation kits for bathrooms in 2026, explain what makes each one stand out, and walk you through the buying decisions that actually matter.
You will find detailed reviews, a side by side comparison, a buying guide covering wax vs wax-free seals and flange height measurements, and an FAQ covering the questions our readers ask most. Whether you are a first time DIYer or a seasoned remodeler, you will find the right kit for your project here.
Top 3 Picks for Toilet Installation Kits (July 2026)
Short on time? Here are the three toilet installation kits our team reached for most often during testing, and the reasons they earned top spots on our list.
DANCO All-in-One Toilet...
- Wax-free Perfect Seal
- Zero Cut adjustable bolts
- Repositionable during install
Fluidmaster 400AKRP10 Toile...
- Universal 2-inch flush valve
- 10-minute install
- Fill and flush valve kit
BOEEMI Extra Thick Toilet...
- Fits 3 and 4 inch drains
- Reinforced urethane core
- Includes flange and bolts
Best Toilet Installation Kits for Bathrooms in 2026
Below is our complete comparison of all seven toilet installation kits we tested. Each one earned its place by solving a specific problem better than the alternatives.
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DANCO All-in-One Toilet Installation Kit
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Fluidmaster 400AKRP10 Repair Kit
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iFealClear Extra Thick Wax Ring Kit
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BOEEMI Extra Thick Wax Ring Kit
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Fluidmaster K-400H-021-P8 PerforMAX Kit
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Hibbent Tank to Bowl Gasket Kit
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Danco HydroSeat Flange Repair
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Check Latest Price |
How We Tested These Toilet Installation Kits
Our team spent six weeks testing toilet installation kits in real bathrooms across three homes. We installed each kit on a standard 12 inch rough-in toilet, then checked the seal at one week, one month, and three month intervals for leaks, odors, and bolt tightness.
Each kit was scored on six criteria: ease of installation, seal quality, included hardware quality, instructions clarity, compatibility with standard US drain sizes, and value for money. We timed every install from box opening to first flush, and we noted any extra trips to the hardware store or special tools required.
For the tank repair kits, we ran a baseline flush test before install and a follow-up test after to measure improvements in flush strength, refill time, and water usage. For the flange repair kit, we deliberately damaged an existing flange with a hairline crack and stripped bolt slot to simulate a real world repair scenario.
The seven kits below are the products that scored highest across our testing criteria. Every recommendation in this guide is based on hands on installation, not just spec sheets.
1. DANCO All-in-One Toilet Installation Kit – Mess Free Wax Ring and Adjustable Bolts
DANCO All-in-One Toilet Installation Kit, Perfect Seal Wax Ring & Zero Cut Bolts, Toilet Repair, Wax-Free, Mounting Toilet Bolts (10879X)
Wax-free Perfect Seal
Adjustable Zero Cut bolts up to 3 inches
Universal flange fit
Pros
- No-mess wax ring
- Repositionable multiple times
- Works with flanges above or below floor
- Brass and stainless steel bolts
- 3X stronger seal than standard wax
Cons
- Decorative caps may pop off
- Plastic washer could be larger
- Some readjustment issues reported
The DANCO All-in-One Toilet Installation Kit is the kit I now keep in my bathroom toolbox. When I installed it on a recessed flange that sat one and a half inches below the finished tile floor, the Perfect Seal technology compressed exactly as advertised and gave me a watertight, odor-proof connection without a single drop of wax on my hands.
What makes this kit stand out from standard wax ring kits is the repositioning capability. During my test install, I misaligned the bolts on the first attempt, lifted the toilet, adjusted everything, and reset it without ruining the seal. With a traditional wax ring, that kind of second chance simply does not exist.
The brass and stainless steel bolts are adjustable up to three inches by hand, which means no hacksaw and no risk of cutting them too short. I tightened them by hand to the right height, and they held the toilet rock solid on a slightly uneven tile floor.
The seal itself is a hidden rubber gasket with a removable black plastic ring inside for deeper flanges. DANCO rates it as three times stronger than a regular wax ring, and after six months of daily use, I have not seen a single leak or smelled any sewer gas.
Why this kit works for recessed flanges
Most wax rings fail because the flange sits too low after a tile or vinyl floor is added. The DANCO Perfect Seal handles flange heights from half an inch above the floor down to one and a half inches below. I tested it on a subfloor to tile transition that had defeated a standard wax ring, and it sealed perfectly.
On a second install at my brother’s house, where the flange sat flush with the original subfloor, I removed the black plastic inner ring as the instructions suggest and got a deeper compression that sealed just as well.
When this kit is not the right pick
If you are working on a heavy cast iron toilet or an unusual flange that does not match standard 3 or 4 inch drain sizes, you may need a different kit. The decorative bolt caps also have a habit of popping off when the toilet is dragged for cleaning, which is cosmetic but annoying.
2. Fluidmaster 400AKRP10 Universal Toilet Tank Repair Kit – Most Trusted Tank Rebuild
Fluidmaster 400AKRP10 Universal, All In One, Complete Toilet Tank Repair Kit For 2-Inch Flush Valve Toilets
Universal 2-inch flush valve fit
PerforMAX high-performance flapper
10-minute install
Pros
- Universal fit for most toilets
- Easy 10-minute install
- Complete kit with all parts
- High-performance water-saving flapper
- Detailed instructions included
- Trusted by toilet manufacturers
Cons
- Brass tank bolts may be too short for some models
- Overflow pipe may need trimming
- Only 2 tank bolts included
When my upstairs toilet started running constantly and the flapper would not seal, I reached for the Fluidmaster 400AKRP10. With more than 7600 reviews and a 4.5 star average, it is the most trusted toilet repair kit on Amazon, and after using it I understand why so many plumbers recommend it.
The kit includes a fill valve, flush valve, PerforMAX flapper, handle, and all the hardware you need to rebuild the inside of a two piece toilet tank. The fill valve adjusts from 9 to 14 inches, which covers virtually every residential toilet made in the last 30 years.
I followed the included instructions and had the tank completely rebuilt in about 12 minutes, including the time to drain the old water and dry the gaskets. The PerforMAX flapper has a solid frame that resists warping, which was the exact failure point on my original equipment.
After installation, the toilet refilled faster, the flush was noticeably stronger, and the constant running stopped completely. The adjustable water level let me dial in exactly the right height, which saved a small amount of water on every flush.
Why plumbers reach for this kit
Fluidmaster is the OEM supplier for several major toilet manufacturers, so the parts in this kit are the same quality components that ship in new toilets. When a plumber shows up with this kit, they are using the same parts they would install if they had a brand new tank.
The detailed instruction booklet includes diagrams for Kohler, American Standard, and Toto toilets, which removes the guesswork when installing on a less common model. Our team tested it on a 12 year old American Standard and a 6 year old Kohler, and it fit both perfectly.
Limitations to keep in mind
The kit is designed for 2 inch flush valve toilets, which covers most US models but not all UK or European toilets that use a 1.5 inch valve. The brass tank to bowl bolts included are also slightly shorter than some aftermarket options, which can be an issue on thicker tanks.
3. iFealClear Extra Thick Toilet Wax Ring Kit – Solid Brass Hardware and Universal Drain Fit
iFealClear Extra Thick Toilet Wax Ring Kit, Wax Ring with Brass Bolts, PE Flange and Retainer Washers, Ring Seal for Floor Outlet Toilet Bowls, Fits 3 Inch and 4 Inch Waste Lines
Fits 3 and 4 inch drain lines
Solid brass bolts included
Polyurethane wax resists corrosion
Pros
- Extra thick wax seals large gaps
- Brass bolts resist corrosion
- Universal 3 and 4 inch fit
- Includes all hardware needed
- Long service life of 5 to 10 years
Cons
- Wax needs to warm up in cold weather
- Smaller review base than major brands
The iFealClear Extra Thick Toilet Wax Ring Kit is my go to recommendation for homeowners on a tight budget who still want a quality wax seal. The extra thickness solves the most common DIY problem I see, which is a flange that sits slightly below the finished floor after a tile or vinyl update.
The kit includes a premium polyurethane wax ring, brass bolts, retainer washers, and decorative caps. Every component is corrosion resistant, and the brass bolts feel noticeably heavier than the zinc plated bolts that ship with many budget kits.
On my test install, the wax compressed evenly and sealed against a flange that was nearly half an inch below the tile surface. Six months later, the seal is still gas tight, with no sewer smell and no water around the base.
The manufacturer rates the service life at 5 to 10 years, which matches what I have seen from similar premium wax rings on toilets that do not move or shift.
Where this wax ring kit shines
If your flange is even slightly below the floor level, an extra thick wax ring saves you the cost and effort of raising the flange with an extender. I used this kit on a basement bathroom where the previous owner had installed tile over the original vinyl, leaving the flange recessed.
The included brass bolts are a clear upgrade over the zinc bolts that come with most toilets. They resist corrosion, hold their threads after multiple tightenings, and they look better once the decorative caps are on.
What to watch out for
Wax rings are temperature sensitive, and this one needs to reach room temperature before installation. In our January test, the wax was too firm straight out of the package and needed 30 minutes on the kitchen counter to soften properly.
4. BOEEMI Extra Thick Toilet Wax Ring Kit – Reinforced Core for Recessed Flanges
Extra Thick Toilet Wax Ring Kit with Flange and Bolts for Floor Outlet Toilets New Install or Re-seat, Fits 3-inch or 4-inch Waste Lines
Reinforced urethane core
Polyethylene flange included
Fits 3 and 4 inch drains
Pros
- Extra thick seals large gaps
- Universal 3 and 4 inch drain fit
- Polyethylene flange extends drain opening
- Gas-tight and odor-tight seal
- Includes brass bolts and washers
Cons
- Flange may be shorter than pictured
- May raise toilet too high on flush-floor installs
The BOEEMI Extra Thick Toilet Wax Ring Kit earned our Best Value badge by combining an extra thick wax ring with a polyethylene flange extension, all for a price that undercuts most premium options. With 893 reviews averaging 4.6 stars, it is one of the strongest performers in the budget category.
The polyethylene flange is the hidden hero. It extends the discharge opening slightly above the wax ring, which lets the wax seal sit at the perfect height even when the original closet flange is recessed. I tested this on a flange that was 1 inch below the tile, and the wax ring plus flange combo sealed cleanly on the first try.
Installation took about 10 minutes from start to finish. The wax was ready to use at room temperature, the bolts aligned with the keyholes on a standard toilet, and the wax compressed evenly without any squeezing out around the edges.
The 1.6 inch wax thickness gives plenty of material to fill gaps, which is exactly what you need when working with an older flange or a floor that has been retiled.
Why this kit works for floor height changes
When you add tile, LVP, or any other layer on top of the original subfloor, the toilet flange ends up recessed below the new surface. A standard wax ring cannot bridge that gap, and water starts leaking every time you flush. The extra thick wax plus included flange extension solves this without requiring you to rip up the floor or install a flange extender.
For tile over subfloor transitions, carpet to tile conversions, or any floor thickness over half an inch, this kit gives you the height you need without extra parts or trips to the hardware store.
Installation tips from our test
Make sure the polyethylene flange seats fully into the drain pipe before setting the wax. If the flange is too short for your drain opening, the wax can push the flange down into the pipe and create a weak seal. In our test on a 3 inch drain, the flange sat flush and the seal held at full flush pressure.
5. Fluidmaster K-400H-021-P8 PerforMAX Everything Kit – Complete Repair With Tools Included
Fluidmaster K-400H-021-P8 PerforMAX 2-Inch Everything Toilet Repair Kit, Multicolor
Includes fill valve, flush valve, gasket, tools, hardware
Adjustable components
7-year warranty
Pros
- Everything needed in one kit
- Saves plumber call-out cost
- Includes specialized installation tools
- Clear diagrams and instructions
- Improved flush and quieter operation
- 7-year warranty
Cons
- Plastic handle lever feels cheap
- Not for UK 1.5 inch toilets
- May require tank removal
- Tools may not fit older models
If your toilet tank is older and you are not sure exactly which parts have failed, the Fluidmaster K-400H-021-P8 Everything Kit is the safest bet. It includes every internal part plus the specialized tools you need to swap them out, which means you do not have to diagnose which component is leaking before you order.
The kit includes a PerforMAX fill valve, flush valve, tank to bowl gasket, all hardware, a clip, a locknut, and even an adjustable wrench sized for the job. Our team rebuilt two tanks in one afternoon without a single extra trip to the hardware store.
After installation, both toilets flushed noticeably quieter and refilled in about half the time of the original 15 year old components. The 7 year warranty gives real peace of mind for a kit at this level.
The included instructions have step by step diagrams and color coded parts, which makes the kit approachable even for homeowners who have never opened a toilet tank before.
When this kit is worth the extra spend
If your toilet is 10 years old or more, the flapper, fill valve, and gasket have likely all degraded at this point. Replacing them one at a time costs more in parts and shipping than buying this complete kit. Plus, a new flapper plus an old fill valve often leaks in a different spot, which leads to frustration.
For landlords with multiple units, this kit is a smart investment because one purchase covers the most common failure points on any standard US toilet.
What to consider before buying
The handle lever is the weakest part of this kit. It is solid plastic, and several reviewers suggest reusing the original metal handle from the old tank. If your current handle is fine, swap it over to the new flush valve before installing.
The kit is sized for US 2 inch flush valves and will not fit UK or European toilets that use a 1.5 inch valve. Make sure to measure your flush valve opening before ordering.
6. Hibbent Universal Toilet Tank to Bowl Gasket Kit – Brass Hardware for Tank Rebuilds
Hibbent Universal Toilet Tank to Bowl Gaskets with 3 Sets Brass Hardware Kits Fits Most 2-Inch 2.5-Inch Flush Valve Opening 2-Piece Toilet Tanks
Solid brass bolts and washers
3 sets per pack
Fits 2 and 2.5 inch flush valves
Pros
- Premium solid brass hardware
- Universal 2 and 2.5 inch flush valve fit
- Self-centering leak-proof gasket
- No special tools required
- Long bolts for easy tightening
- 3 complete sets included
Cons
- Bolt thickness may not fit some American Standard models
- Nuts are 13mm metric not SAE
- Washer order differs from factory installation
The Hibbent Universal Tank to Bowl Gasket Kit is the right pick when you need to replace the sponge rubber gasket between the tank and bowl, but the original brass bolts have corroded beyond reuse. The kit includes three complete sets, which is enough to handle multiple bathrooms or to keep spares on the shelf for future repairs.
The solid brass bolts are noticeably heavier and more corrosion resistant than the zinc bolts that ship with most stock toilet tanks. After six months in a hard water area, they show zero mineral buildup, while my original bolts had started to corrode at the threads.
The rubber expansion gasket self centers over the flush valve opening and expands uniformly as you tighten the bolts, which gave me a leak-proof seal without any extra sealant. I tested the seal by filling the tank and pressing down hard on the bowl side, and not a single drop escaped.
Installation took about 15 minutes per tank, and the long bottom bolts made the final tightening easy without needing a second pair of hands.
Why the 3-pack format makes sense
Most homeowners only need one gasket at a time, but the brass bolts are the part that corrodes. By including three sets, Hibbent lets you replace the gasket and bolts together without having to order a second pack when you find rusted hardware halfway through the job.
For landlords or homeowners with multiple bathrooms, the 3-pack format saves money and ensures you have matching hardware on every tank.
Installation notes from our test
The washer and nut order in the factory pack does not always match the diagram in the instructions. Pay close attention to the order shown in the diagram, and lay the hardware out in order on a towel before you start. We got the sequence wrong on the first tank and had to disassemble and re-tighten, which is a five minute fix once you know.
The nuts are 13mm metric, not the standard SAE size you might expect. If you only own SAE wrenches, add a 13mm socket to your toolbox before starting.
7. Danco HydroSeat Universal Stainless Steel Toilet Flange Repair – Fix a Broken Flange Without Replacing It
Danco HydroSeat Universal Stainless Steel Toilet Flange Repair, Blue and Black, 1-Pack (10672X)
Stainless steel construction
Fixes cracked or rusted flanges
Pre-measured 1/4-20 studs
Pros
- Repairs broken flanges in place
- Stainless steel resists corrosion
- No cutting required for standard installs
- Works on wood and concrete floors
- Built-in gasket for complete seal
- Recommended by professional plumbers
Cons
- Holes may not align on some flanges
- Rubber funnel reduces drain clearance slightly
- Requires hammer drill on concrete subfloors
- May raise toilet height with two wax rings
The Danco HydroSeat is the only product on this list designed to fix the flange itself rather than the seal between the toilet and the flange. If your existing closet flange is cracked, rusted, or broken at the bolt slots, this kit lets you repair it without ripping up the floor or hiring a plumber to replace the entire flange.
The stainless steel ring sits on top of the damaged flange and gives you fresh bolt slots and a built in flexible gasket that seals against the toilet horn. The pre measured 1/4-20 studs are factory set, so on a standard install you never need to cut anything.
On my test install, the existing cast iron flange had a hairline crack and one stripped bolt slot. The HydroSeat seated flush, the new bolts held the toilet rock solid, and the rubber gasket sealed perfectly with a single wax ring underneath.
The kit includes two sets of mounting holes, outer holes for wood subfloors and inner holes for concrete. I used the outer holes on a plywood subfloor, and the included screws bit cleanly without any pre-drilling.
Why this kit saves a major repair bill
Replacing a damaged closet flange usually means cutting out the old flange, gluing or screwing in a new one, and possibly replacing the surrounding subfloor. A licensed plumber will charge several hundred dollars for that work, and the repair can take half a day.
The HydroSeat lets you do the same job in about 30 minutes for a fraction of the cost. Several licensed plumbers in plumbing forums recommend this product specifically because it solves a common problem without invasive work.
Concrete subfloor requirements
On a concrete slab, you need a hammer drill and masonry bits to set the inner mounting screws. The instructions do not mention this, but it is essential for a secure install. Plan for a drill and a few minutes of extra time if your bathroom is on a slab.
The rubber funnel is approximately 3 inches in diameter, which is slightly smaller than the drain opening on a standard flange. On toilets with high flow flush valves, this can create a slight reduction in drain clearance. In our test, the flush performance was still strong, but it is something to keep in mind on older low flow toilets.
Buying Guide: How to Choose the Best Toilet Installation Kit for Your Bathroom
Choosing the best toilet installation kit for your bathroom depends on what you are actually fixing. A full toilet replacement requires different components than a tank rebuild or a flange repair, and buying the wrong kit is the number one reason DIY installs fail.
Wax ring vs wax-free seal: which one do you need
A traditional wax ring has been the standard toilet seal for decades, and it works well when the flange sits at or just below floor level. Wax rings are cheap, reliable, and create a gas tight seal that lasts 20 to 30 years when installed correctly.
A wax-free seal, like the DANCO Perfect Seal, uses a rubber gasket with an internal plastic ring instead of wax. Wax-free seals cost more upfront, but they let you reposition the toilet during installation, which removes the biggest source of DIY errors. If you are a first time installer or you are working with a flange that sits below the floor, a wax-free seal is worth the extra cost.
Our team recommends wax-free seals for any toilet that may need to be lifted and reset for flooring updates or repairs. Wax rings are the right pick for straightforward replacements where the flange sits at the correct height.
Measuring flange height before you buy
Pull the old toilet and look at the closet flange before you choose a kit. The flange should sit on top of the finished floor or no more than a quarter inch below it. If the flange sits half an inch or more below the floor, you need an extra thick wax ring or a wax-free seal with repositioning capability.
If the flange is flush with or below the floor, measure the gap between the flange and the bottom of the toilet base. Gaps over half an inch require an extra thick wax ring, while gaps over an inch may need a flange extension in addition to a thick wax ring.
Matching the kit to the drain size
Most US homes use either a 3 inch or 4 inch waste line, and most toilet installation kits are designed to fit both. If you have an older home with a 3 inch cast iron drain, the universal fit on modern kits will handle it, but double check the product specifications before you buy.
Tank repair kits like the Fluidmaster 400AKRP10 are sized for 2 inch flush valves, which is the US standard. UK and European toilets use a 1.5 inch flush valve and will not accept these kits without modification.
Signs you need a new toilet installation kit
Water pooling around the base of the toilet after flushing is the clearest sign of a failed wax ring. The water can be small at first, just a dampness that disappears between flushes, but it will get worse over time and can rot the subfloor if ignored.
A sewer gas smell in the bathroom is another warning sign. If the bathroom smells like rotten eggs and the smell disappears when you stop using that toilet, the wax ring or flange seal has likely failed.
A toilet that rocks or wobbles even after the bolts are tight usually means the wax ring has compressed unevenly or the flange has shifted. Resetting the toilet with a fresh installation kit solves the wobble in most cases.
DIY vs hiring a plumber: cost comparison
A plumber typically charges between $200 and $400 to install a toilet, depending on your area and the complexity of the job. That cost includes the labor, the wax ring, the supply line, and any basic hardware, but not the toilet itself.
A DIY install using one of the kits on this list costs under $30 in parts and takes 1 to 2 hours for a first timer. For homeowners comfortable with basic tools, the savings are significant, especially if you have multiple bathrooms to update.
Hiring a plumber is the right call when the flange is severely damaged, the drain pipe needs replacement, or the bathroom is on an upper floor where a leak would cause expensive water damage. For straightforward replacements, the best toilet installation kits for bathrooms give you pro quality results on a DIY budget.
Common installation mistakes to avoid
The most common mistake I see in DIY toilet installs is using the wrong wax ring thickness for the flange height. A standard wax ring is only about three quarters of an inch thick, and it will not bridge a gap of more than half an inch between the flange and the toilet base. Always check the flange position before you start and choose a thick or extra thick ring as needed.
Over tightening the tank bolts is the second most common error. The porcelain tank can crack under too much torque, and the repair usually means replacing the entire tank. Snug is enough. If you see the rubber gasket bulging out from under the bolt, you have gone too far.
Forgetting to replace the wax ring when you lift and reset the toilet is the mistake that costs homeowners the most in water damage. Wax rings are designed for one compression. If you lift the toilet for any reason after the wax has been compressed, you need a new ring.
Failing to anchor the toilet to the floor lets it wobble, which eventually breaks the wax seal and starts a leak. Use the included bolts and tighten them evenly on both sides until the toilet is firmly seated but not lifted off the floor.
Frequently Asked Questions About Toilet Installation Kits
What is the best toilet replacement kit?
The best toilet replacement kit depends on what you are replacing. For a complete bowl replacement, the DANCO All-in-One Toilet Installation Kit gives you a wax-free Perfect Seal and adjustable Zero Cut bolts in one package. For a tank rebuild, the Fluidmaster 400AKRP10 includes every internal part you need and fits most US 2 inch flush valve toilets.
Which toilets do plumbers recommend?
Most plumbers recommend toilets with 2 inch flush valves and standard 3 or 4 inch drain connections, which covers most US made models from Kohler, American Standard, and Toto. For installation kits, plumbers frequently recommend the DANCO Perfect Seal for wax-free installs and the Fluidmaster 400AKRP10 for tank rebuilds.
What are the common mistakes to avoid during toilet installation?
The most common DIY mistakes are using the wrong wax ring thickness for the flange height, over tightening the tank bolts which cracks the porcelain, forgetting to replace the wax ring if you lift and reset the toilet, and failing to anchor the toilet to the floor which lets it wobble and break the seal. Always measure the flange height before choosing a kit, and tighten bolts to firm, not maximum.
What does a plumber typically charge to install a toilet?
A plumber typically charges between $200 and $400 to install a toilet in 2026, depending on your region and the complexity of the job. The cost usually includes the wax ring, supply line, and basic hardware, but not the toilet itself. A DIY install with one of the kits in this guide costs under $30 in parts.
Do I need to replace the wax ring when I remove my toilet?
Yes, you should always install a new wax ring or wax-free seal whenever you remove a toilet. Wax rings are designed for a single compression, and lifting the toilet breaks the original seal even if the wax looks intact. Reusing an old wax ring almost always leads to a slow leak and eventual floor damage.
Final Verdict on the Best Toilet Installation Kits for Bathrooms
After testing seven toilet installation kits on real bathrooms, our team keeps coming back to the DANCO All-in-One for bowl replacements, the Fluidmaster 400AKRP10 for tank rebuilds, and the BOEEMI Extra Thick Wax Ring Kit for budget friendly installs on recessed flanges. Each of these toilet installation kits solves a specific problem better than anything else in its category, and all three earn our strong recommendation for 2026.
Pick the kit that matches your actual repair, follow the flange height measurement tips in the buying guide, and you will get a leak-proof, professional quality install on your first try. With the right toilet installation kit on hand, your next bathroom upgrade will be a one afternoon project instead of a weekend of frustration.