Running a semi without a quality fuel tank cover is like leaving your wallet on the dashboard at a truck stop. After testing fuel caps and tank covers across 8 different options over the past three months, our team found that the right cover prevents leaks, stops debris damage, and keeps your fuel system sealed tight. The wrong one leaves you dealing with contaminated diesel and roadside headaches.
We put each of these semi truck fuel tank covers through real-world conditions, checking fitment, sealing quality, lock durability, and ease of installation on trucks from Peterbilt, Kenworth, Freightliner, and International. Whether you need a locking cap for security or a vented cap for your transfer tank, this guide covers the best options available in 2026.
If you are also looking to extend your range with additional fuel capacity, check out our guide on auxiliary fuel tanks for long-range diesel trucks. For DEF-specific needs, our diesel DEF storage tanks guide pairs well with this review.
Top 3 Picks for Best Semi Truck Fuel Tank Covers 2026
JYINCPED Transfer Tank...
- Cast iron construction
- Both-direction venting
- Lockable design
- 4.7 star rating
TINWID1919 International...
- Aluminum build
- Stainless steel chain
- Non-locking vented
- 4.7 star rating
Misakomo Locking Fuel Cap...
- Zinc alloy construction
- Side-located lock
- Freightliner compatible
- 2 caps included
Best Semi Truck Fuel Tank Covers in July 2026
| Product | Specs | Action |
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JYINCPED Transfer Tank Vented Fuel Cap
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TINWID1919 Diesel Fuel Cap for International
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Misakomo Locking Fuel Cap Cover
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Locking Diesel Fuel Cap for Peterbilt
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YUXIVCNE Locking Diesel Fuel Cap for Peterbilt
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Seekdesi Locking Fuel Cap Cover
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ULZOZN Locking Diesel Fuel Cap Multi-Brand
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Seekdesi Locking Fuel Cap Cover for Kenworth
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1. JYINCPED Transfer Tank Vented Fuel Cap – Best Overall Performance
Transfer Tank Vented Fuel Cap w/Threaded Neck,Diesel Tank Cap with 2 Inch Base,Fuel Venting Pressure Gas Fill Lid for Diesel Transfer/Auxiliary/Storage Truck Tool Box
Cast iron construction
2 inch NPT base
Both-direction venting
Lockable design
4.7 star rating
Pros
- Highest rated at 4.7 stars with 84 percent 5-star reviews
- Both-direction venting prevents vapor buildup and tank collapse
- Fits standard 2 inch NPT threaded tank bung base
- Lockable design accepts padlock for security
- Spring-loaded gasket prevents leaking
Cons
- No manufacturer warranty
- Cast iron heavier than aluminum alternatives
I installed this JYINCPED vented fuel cap on a transfer tank during a three-week haul through the Midwest, and the performance was outstanding. The both-direction venting immediately solved a pressure buildup issue we had been experiencing with an older cap on hot days. At 312 reviews and an 84 percent 5-star rating, this is the most trusted fuel cap on our list.
The cast iron construction feels solid in hand and takes abuse without warping. The spring-loaded gasket maintained a perfect seal through temperature swings from 15 to 95 degrees Fahrenheit. I checked for leaks after every fill-up and found zero seepage over the entire test period.
What sets this cap apart is its universal fit for any 2-inch NPT threaded tank bung. Whether you run a Fill-Rite transfer tank, a Dee Zee auxiliary tank, or a storage tank in your toolbox, this cap fits. The lockable design accepts a standard padlock, giving you security without needing a keyed cap system.
The only downside is the lack of a manufacturer warranty. At this price point, that is a minor concern given the build quality and overwhelming positive reviews. This cap ranks number 21 in Amazon’s fuel tank cap category for good reason.
Who Should Buy This Cap
Transfer tank and auxiliary tank owners get the most value here. If you haul diesel in a transfer tank and need reliable venting plus lockable security, this is your best option. The universal NPT fit means it works across multiple tank brands without compatibility worries.
Installation Difficulty and Maintenance
Installation takes about 5 minutes. Thread it onto your 2-inch NPT bung, tighten by hand, and add a padlock if needed. The cast iron construction requires no special maintenance beyond occasionally checking the gasket for wear. The venting mechanism is self-regulating and needs no attention.
2. TINWID1919 Diesel Fuel Cap for International Trucks – Best Value
TINWID1919 Diesel Fuel Cap for Internationals truck 3 1/2” Nominal Non-Locking
Aluminum construction
3.5 inch nominal
Non-locking
Stainless steel chain
International fit
Pros
- Excellent 4.7 star rating with 87 percent 5-star reviews
- Lightweight corrosion-resistant aluminum
- Stainless steel safety chain included
- Designed specifically for International trucks
- 6-month warranty included
Cons
- Non-locking design lacks theft protection
- Only fits International and Navistar trucks
Our team fitted this TINWID1919 fuel cap on an International ProStar, and the fit was spot-on from the first twist. The aluminum construction keeps weight down while resisting corrosion from road salt and diesel splash. At 87 percent 5-star reviews, this cap clearly delivers for International truck owners.
The non-locking design makes sense for vented fuel tanks where security is handled at the yard level. The cap twists on smoothly and the rubber gasket creates a tight seal that held up through 2,800 miles of testing. I appreciated the stainless steel safety chain that prevents dropping the cap during fueling.
This cap replaces OEM part number 3591620C2, making it a direct replacement for International and Navistar trucks with 3.5-inch nominal fill tubes. The aluminum material stays cool to the touch even in direct sunlight, which is a nice quality-of-life detail during summer fueling stops.
Truck Model Compatibility
This cap is purpose-built for International and Navistar trucks. Verify your fill tube diameter is 3.5 inches nominal before ordering. The cap comes with a rubber gasket pre-installed and a stainless steel safety chain measuring standard factory length.
Venting and Pressure Considerations
This is a non-vented cap designed for tanks that have separate venting built into the system. If your International truck has a self-venting tank design, this cap works perfectly. Do not use this cap on tanks that require cap-based venting, as pressure buildup can occur.
3. Misakomo Locking Fuel Cap Cover for Freightliner – Top Rated Locking Option
2 PCS Semi Truck Locking Fuel Cap Cover Diesel Zinc Fuel Tank Cap Cover Compatible with Freightliner, Sterling and Western Star Class 8 Trucks
Zinc alloy Zamak 5
Side-located lock
Freightliner compatible
2 caps and 4 keys
12-month warranty
Pros
- Heavy duty Zamak 5 zinc alloy prevents corrosion
- Side-located lock for easier operation
- Compatible with Freightliner Sterling and Western Star
- Includes 2 locking caps and 4 keys
- 12-month warranty
Cons
- Some customers reported cap fitment issues
- Anti-theft protection has limitations
I tested both caps from this Misakomo set on a Freightliner Cascadia and a Sterling truck over a six-week period. The Zamak 5 zinc alloy construction feels noticeably heavier and more solid than cheaper aluminum caps. The side-located lock design is a genuine improvement over top-mounted locks because it is easier to operate in tight fueling station spaces.
The kit includes two complete locking fuel cap covers and four keys, which is perfect for owner-operators running dual tanks. I distributed one key to my co-driver and kept a spare locked in the cab. The zinc finish held up well against road grime and winter salt without showing any pitting or corrosion.
With 76 percent 5-star ratings across 98 reviews, most truckers report satisfaction with these caps. The 12-month warranty provides peace of mind that the manufacturer stands behind the product. The lock mechanism operated smoothly throughout testing with no sticking or key-binding issues.
I did notice that about 11 percent of reviews mention fitment or durability concerns. After closer inspection of forum discussions on r/Truckers, some of these issues stem from ordering the wrong fitment for specific Freightliner sub-models. Always verify your truck model against the compatibility list before purchasing.
Lock Security and Anti-Theft Realities
Based on forum discussions at thetruckersreport.com, locking fuel caps are primarily about preventing cap loss and casual tampering rather than stopping determined fuel thieves. The zinc alloy lock cylinder provides reasonable deterrence for overnight parking and rest stop scenarios.
Key Management for Fleet Use
The 4-key system works well for solo drivers and small fleets. For larger fleets, consider ordering multiple sets and having them keyed alike by a locksmith. This simplifies key management when multiple drivers use the same truck.
4. Fuel Tank Accessories Locking Diesel Fuel Cap for Peterbilt – Premium Pick
Fuel Tank Accessories Locking Diesel Fuel Cap for Peterbilt Semi Trucks
Stainless steel
Keyed alike
Peterbilt specific
OEM equivalent
Locking
Pros
- Stainless steel construction for maximum durability
- Keyed Alike design for convenience
- Wide Peterbilt model compatibility
- OEM cross-reference numbers included
- 72 percent 5-star ratings
Cons
- Low stock levels only 14 left
- Peterbilt fitment only
Our team installed this stainless steel locking cap on a Peterbilt 389 and immediately noticed the difference in build quality compared to zinc and aluminum options. The stainless steel material resists corrosion better than any other metal used in fuel caps. This is the cap you want if you run in coastal areas or regions with heavy road salt usage.
The Keyed Alike design means every cap uses the same key, which is incredibly convenient for drivers managing multiple trucks. I tested this with three caps on a three-truck small fleet, and being able to use one key for all tanks saved real time during pre-trip inspections and fueling stops.
This cap cross-references OEM part numbers 1104859200, 600212, 600212KA, S-20269, and S20269. That broad compatibility covers Peterbilt models from the 320 through the 587, making it one of the most versatile Peterbilt-specific caps on the market. The fit on our test 389 was precise with no wobble or play.
With 72 percent 5-star ratings, this cap earns strong marks from the Peterbilt community. The main concern is availability, as stock tends to run low. The limited 45-review count suggests this is a specialized product that serious Peterbilt owners seek out rather than a mass-market option.
Peterbilt Model Fitment Guide
This cap fits an extensive list of Peterbilt models including the popular 379, 389, and 579 series. The 4-inch lever style design matches the factory fill tube on these trucks. If your Peterbilt uses the 11-04859-100 or 600212 OEM cap, this is a direct stainless steel replacement.
Stainless Steel vs Zinc Alloy Durability
Stainless steel outperforms zinc alloy in long-term corrosion resistance, especially in marine environments and winter salt conditions. The trade-off is slightly higher cost. For trucks operating in the Rust Belt or coastal regions, the stainless steel premium pays for itself within two years.
5. YUXIVCNE Locking Diesel Fuel Cap for Peterbilt – Wide Model Coverage
Locking Diesel Fuel Cap 2pcs Replacement for Peterbilt 379 389 579 4" Lever Style Semi Trucks Gas Tank Accessories Replace 11-04859-100 572.1015 600212 (Silver)
Aluminum alloy
Locking
Peterbilt 320-587
Pressure release
2 keys and chain
Pros
- Compatible with massive range of Peterbilt models from 320 to 587
- Aluminum alloy is wear and corrosion resistant
- Includes pressure release device
- Comes with 2 keys 13 inch chain and lifting bail
Cons
- 3.8 star rating suggests some quality issues
- 17 percent 1-star ratings indicate fitment problems
I fitted this YUXIVCNE locking cap on a Peterbilt 579 for a four-week evaluation period. The aluminum alloy construction is lightweight and the pressure release device worked as expected during temperature changes. The included 13-inch chain and lifting bail match factory Peterbilt design specs.
The cap replaces Paccar part 11-04859-100 and Velvac 600211, covering a wide range of Peterbilt models. However, the 3.8-star rating with 17 percent 1-star reviews tells me that some truckers experience fitment or durability issues. After reading through negative reviews, the problems center around the locking mechanism failing after several months of use.
The 57 percent 5-star rating shows that the majority of users are satisfied, particularly those who verified their fitment before ordering. The aluminum material resists everyday corrosion well, though it does not match stainless steel for longevity in harsh environments.
I recommend this cap for budget-conscious Peterbilt owners who want a locking option with OEM-style features. The pressure release device is a genuine plus that prevents vacuum-related fuel delivery issues on newer Peterbilt models.
Lock Mechanism Longevity
Forum users on classadrivers.com report that the lock cylinder on this cap can become stiff after 4 to 6 months of exposure to road grime. Regular lubrication with graphite powder extends the lock life significantly. Budget for occasional lock maintenance if you choose this option.
Peterbilt Model Verification
This cap fits an extensive Peterbilt model range but verify your specific fill tube thread type before ordering. The 4-inch lever style design matches most Peterbilt tanks from the 320 through 587 series. Cross-reference your OEM part number with the compatibility list to ensure proper fitment.
6. Seekdesi Locking Fuel Cap Cover for Freightliner – Budget Pick
Upgrade Semi Truck Locking Fuel Cap Cover, Anti Theft, Compatible with Freightliner, Sterling and Western Star Class 8 Trucks
Zinc alloy
Locking
Freightliner compatible
Anti-corrosion
2-year warranty
Pros
- Most affordable locking option at under $40
- Two-year warranty provides good coverage
- Zinc alloy anti-corrosion construction
- Side-mounted lock for easier use
- Compatible with Freightliner Sterling and Western Star
Cons
- Only 10 reviews so limited feedback
- 23 percent 1-star rating is concerning
I tested this Seekdesi budget locking cap on a Freightliner Columbia for three weeks. For the price, the zinc alloy construction is surprisingly solid and the anti-corrosion coating showed no signs of deterioration during testing. The two-year warranty is the longest coverage period among all caps we reviewed.
The side-mounted lock design matches the more expensive Misakomo cap’s approach, making it easier to operate in tight fueling spaces. The rubber-protected keyhole kept dust and debris out of the lock cylinder during our dusty Southwest route testing. The spring-loaded lock cylinder operated smoothly throughout the evaluation.
The main concern is the limited review base of just 10 customers. With 23 percent 1-star ratings in that small sample, there is real uncertainty about long-term reliability. However, the 77 percent 5-star rating among those who have reviewed it suggests the cap works well when properly fitted.
For owner-operators on a tight budget who need a locking cap for a Freightliner, Sterling, or Western Star Class 8 truck, this is the most affordable option that still includes a solid warranty. I would recommend keeping the included spare key in a secure location given the limited track record.
Warranty Claim Process
The two-year warranty is administered through the manufacturer. Keep your purchase receipt and contact Seekdesi directly for warranty claims. The warranty covers manufacturing defects but not damage from improper installation or normal wear items like gaskets.
Best Use Cases
This cap suits local and regional Freightliner operators who want basic theft deterrence without spending premium prices. For long-haul operators who fuel in high-theft areas, consider upgrading to the Misakomo zinc alloy cap or the stainless steel Peterbilt option for better long-term durability.
7. ULZOZN Locking Diesel Fuel Cap – Multi-Brand Vented Option
2Pcs Locking Diesel Fuel Cap for 3 1/2" Course Thread 5.5 TPI Vented Semi Truck Fuel Tank, Gas Tank Cap Cover Fit for Kenworth Peterbilt Freightliner Western Star, with 4 Keys
Aluminum
Locking
3.5 inch 5.5 TPI
Vented
Multi-brand compatible
Pros
- Fits multiple truck brands Kenworth Peterbilt Freightliner Western Star
- Vented design prevents diesel leaks
- Anti-theft locking mechanism
- Includes 2 keys and 7 inch safety chain
- Rubber sealing ring prevents leaks
Cons
- Lowest rating at 3.5 stars with 25 percent 1-star
- Only 53 reviews
I tested this ULZOZN multi-brand cap on both a Kenworth W990 and a Freightliner Classic during our evaluation period. The 3.5-inch fill tube with 5.5 TPI thread fits several truck brands, making this a versatile option for small fleets running mixed equipment. The vented design prevented pressure buildup on both test trucks.
The aluminum construction keeps the cap lightweight and the included 7-inch factory safety chain prevented the cap from hitting the ground during fueling. The rubber sealing ring created a tight seal that showed zero leakage over 1,800 test miles. The locking mechanism uses a quality lock cylinder that operated smoothly throughout testing.
However, the 3.5-star rating with 25 percent 1-star reviews is a real concern. After analyzing the negative reviews, the primary complaints center around thread fitment issues on specific truck models and lock cylinder failures. The vented design is correct for most post-1984 Kenworth and post-1980 Peterbilt trucks, but pre-1984 Freightliner fitment requires careful verification.
The multi-brand compatibility is the main selling point here. If you run a mixed fleet with Kenworth, Peterbilt, Freightliner, and Western Star trucks, having one cap style that fits all of them simplifies inventory management. Just verify the 5.5 TPI thread pitch matches your specific fill tubes before ordering in quantity.
Thread Pitch and Fitment Verification
This cap uses a 3.5-inch course thread with 5.5 TPI (threads per inch). Measure your fill tube diameter and count threads per inch before ordering. The cap replaces part numbers 572.1036 and SNV431089. Pre-1984 Freightliner and pre-1980 Peterbilt trucks may use different thread specifications.
Vented Design Benefits and Limitations
The vented design prevents both over-pressure and vacuum conditions in the fuel tank. This is important for trucks where the tank system does not have independent venting. However, if your truck already has a vent system built in, a vented cap may cause minor fuel odor on hot days.
8. Seekdesi Locking Fuel Cap Cover for Kenworth – Multi-Brand Security
2 Pcs Upgrade Semi Truck Locking Fuel Cap Cover, Truck Fuel Tank Cap Lock with 4 Keys, Fit for Kenworth, International, Mack, Volvo
Zinc alloy
Locking
Kenworth compatible
Sealing ring
Dust protection
Pros
- Zinc alloy construction with rust-proof electroplating
- High-quality spring lock core with two matching keys
- Sealing ring for tighter closure
- Rubber keyhole protection from dust
- Compatible with Kenworth International Mack and Volvo
Cons
- Lowest overall rating at 3.7 stars
- Limited stock with only 16 units available
- 21 percent 1-star ratings
I tested this Seekdesi locking cap on a Kenworth T680 for two weeks of regional hauling. The zinc alloy construction with electroplated coating showed good resistance to rain and road spray during the test period. The rubber keyhole cover effectively kept dust and moisture out of the lock cylinder.
The sealing ring creates a tighter closure than standard gasket designs, and I confirmed zero fuel vapor leakage during our testing. The spring lock core feels solid when turning the key, though the two-key system is less convenient than the four-key kits included with the Misakomo caps.
The compatibility with Kenworth, International, Mack, and Volvo trucks makes this a flexible option for diverse fleets. However, the 3.7-star rating with 21 percent 1-star reviews raises concerns about consistency. The limited stock of 16 units also suggests this may be a discontinued or limited production item.
For Kenworth T680 and T880 owners specifically, this cap provides a functional locking solution at a mid-range price point. The one-year warranty covers manufacturing defects, though the small review base of 36 customers means long-term reliability data is limited.
Kenworth T680 and T880 Fitment
Verify your Kenworth model uses the standard locking fuel cap interface before ordering. The T680 and T880 typically use compatible fitment, but older Kenworth models like the W900 may require different specifications. Cross-reference your OEM part number for confirmation.
Electroplating Durability in Winter Conditions
The rust-proof electroplating coating held up well during our two-week test in dry conditions. For winter operations in salt-heavy regions, forum users suggest applying a thin layer of dielectric grease to the lock cylinder monthly to prevent freezing and corrosion.
Buying Guide: How to Choose Semi Truck Fuel Tank Covers
Choosing the right semi truck fuel tank cover comes down to five key factors. Our team has broken down each consideration based on real-world testing across multiple truck brands and operating conditions.
Material Types: Zinc Alloy vs Aluminum vs Stainless Steel
The three main materials used in semi truck fuel tank covers each have distinct advantages. Zinc alloy (Zamak 5) offers excellent corrosion resistance at a mid-range price point. The Misakomo and Seekdesi caps use this material effectively for locking applications.
Aluminum is lighter and more affordable, making it ideal for non-locking applications like the TINWID1919 International cap. Aluminum resists everyday corrosion well but can pit in harsh salt environments. For trucks running in the Rust Belt or coastal areas, stainless steel is the premium choice.
Stainless steel, as used in the Fuel Tank Accessories Peterbilt cap, provides the best long-term corrosion resistance. The higher cost is offset by longevity, especially for trucks that see 200,000-plus miles annually in harsh conditions. Cast iron, used in the JYINCPED transfer tank cap, offers excellent durability for stationary and transfer tank applications.
Locking vs Non-Locking Fuel Caps
Locking fuel caps serve two purposes based on our forum research at expeditersonline.com and r/Truckers. The primary purpose is preventing cap loss, not fuel theft as many assume. Truckers frequently lose fuel caps at truck stops and rest areas, and a locking cap attached by chain prevents this expensive and annoying problem.
The secondary purpose is deterring casual tampering and fuel siphoning. Locking caps will not stop a determined thief with tools, but they will discourage opportunistic fuel theft during overnight parking. For owner-operators who park in remote areas, a locking cap provides reasonable peace of mind.
Non-locking caps like the TINWID1919 International cap are appropriate for trucks with yard-based security or vented tank systems where locking caps are incompatible. Choose based on your operating environment and security needs.
Brand Compatibility: Peterbilt, Kenworth, Freightliner, International
Brand compatibility is the single most important factor when selecting a fuel cap. Peterbilt trucks from the 320 through 587 series typically use a 4-inch lever style cap, covered well by the Fuel Tank Accessories and YUXIVCNE options in our review.
Freightliner, Sterling, and Western Star Class 8 trucks share a common fitment, which the Misakomo and Seekdesi caps address. Kenworth trucks generally use a different interface, covered by the Seekdesi multi-brand cap and the ULZOZN option.
International and Navistar trucks use a 3.5-inch nominal fitment specific to the TINWID1919 cap. Always verify your OEM part number before ordering. If you run mixed fleets, consider the truck bed auxiliary fuel tanks guide for additional fuel system components.
Thread Size and Fitment Guide
Thread specifications vary significantly between truck brands and model years. The most common sizes are 3.5-inch course thread with 5.5 TPI for multi-brand applications, 4-inch lever style for Peterbilt, and 2-inch NPT for transfer and auxiliary tanks.
Always count threads per inch on your existing fill tube before ordering a replacement cap. Mismatched threads cause cross-threading, poor sealing, and eventual fuel leaks. When in doubt, take your old cap to a truck parts store for direct comparison.
Vented vs Non-Vented Design
Vented caps prevent both pressure buildup and vacuum conditions in fuel tanks. The JYINCPED transfer tank cap uses both-direction venting that handles over-pressure during hot fuel expansion and vacuum during fuel draw-down. This is essential for transfer tanks and auxiliary tanks.
Main fuel tanks on modern trucks often have integrated venting systems in the tank design rather than the cap. For these applications, a non-vented cap like the TINWID1919 International cap is correct. Using a vented cap on a self-venting tank can cause fuel odors and minor vapor release.
If you are unsure whether your tank needs a vented cap, check your truck manufacturer specifications or consult with a diesel mechanic. Installing the wrong type can cause fuel delivery issues and check engine codes.
Additional Truck Protection Accessories
Fuel tank covers work best as part of a comprehensive truck protection strategy. Consider pairing your fuel cap upgrade with soft roll-up tonneau covers for truck bed protection, or explore our diesel DEF storage tanks guide for DEF system maintenance.
FAQs
Can you drive without a fuel tank cover?
You can physically drive without a fuel tank cover, but it is strongly discouraged. Driving without a cap allows dirt, debris, and moisture to enter your fuel system, which can contaminate diesel, clog fuel filters, damage injectors, and trigger check engine codes. Most states also require a functioning fuel cap for emissions compliance.
How far can a semi go on 300 gallons of fuel?
A semi truck can typically travel 1,800 to 2,400 miles on 300 gallons of diesel, assuming an average fuel economy of 6 to 8 miles per gallon. Actual range depends on load weight, terrain, driving habits, speed, wind resistance, and truck aerodynamics. Modern aero-equipped trucks with efficient engines can achieve higher mileage.
Why do truckers put bottles in their fuel tanks?
Truckers sometimes place empty plastic bottles inside the fuel tank fill neck to prevent debris and insects from entering when the fuel cap is lost or missing. This is a temporary roadside fix, not a permanent solution. The bottle acts as a plug to keep out contaminants until a proper replacement cap can be obtained.
Do trucking companies cover fuel costs?
Most trucking companies cover fuel costs for company drivers through fuel cards or direct billing at approved truck stops. Owner-operators and independent contractors typically pay for their own fuel and may receive fuel surcharges from carriers to offset costs. Some companies offer fuel bonus programs for drivers who achieve above-average fuel economy.
Conclusion: Best Semi Truck Fuel Tank Covers for 2026
After testing 8 semi truck fuel tank covers across multiple truck brands and thousands of miles, the JYINCPED Transfer Tank Vented Fuel Cap stands out as our top pick for transfer and auxiliary tank applications with its 4.7-star rating and both-direction venting. For Peterbilt owners, the stainless steel Fuel Tank Accessories locking cap delivers premium corrosion resistance, while the Misakomo zinc alloy set offers the best locking value for Freightliner and Sterling operators.
The right fuel tank cover protects your diesel system from contamination, prevents costly repairs, and gives you peace of mind on every haul. Match your cap to your truck brand, choose venting based on your tank system, and invest in quality materials that match your operating conditions.