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TOP 10 BEST AUTOMOTIVE REPLACEMENT CAPS TO BUY

The Best Automotive Replacement Caps to Buy for Your Vehicle

Find the best automotive replacement caps, including tire valve stem caps, fuel caps, and vacuum cap assortments, to ensure your vehicle is sealed and protected.

Automotive caps might seem like small components, but they play a crucial role in maintaining your vehicle's performance, safety, and efficiency. From preventing air leaks in your tires to sealing your fuel tank or vacuum lines, having the right replacement caps is essential for any car owner or mechanic.

Whether you need durable tire valve stem caps that offer an airtight seal, a new gas cap to prevent EVAP system errors, or a versatile assortment of vacuum caps for engine maintenance, selecting high-quality products ensures longevity and reliability. We've compiled a list of the top automotive replacement caps currently available, covering a range of applications and vehicle types.

Explore our top picks below to find the perfect caps to keep your car, truck, motorcycle, or SUV running smoothly and protected against the elements.

01
Tire Valve Stem Caps The Upgraded Version has a Sealing Ring for Car, Motorbike, Trucks, Bike, Bicycle （Black） (24)

Tire Valve Stem Caps The Upgraded Version has a Sealing Ring for Car, Motorbike, Trucks, Bike, Bicycle （Black） (24)

Unbranded

4.8 (587 reviews)
  • Upgraded internal sealing ring for superior airtight performance.
  • Universal fit for cars, trucks, motorcycles, bikes, and bicycles.
  • Durable black finish resists corrosion and wear.
  • Comes in a large pack of 24 caps, ideal for multiple vehicles or replacements.

$3.77

02
Dorman 47397 Vinyl Color Vacuum Cap Assortment Universal Fit

Dorman 47397 Vinyl Color Vacuum Cap Assortment Universal Fit

Dorman

4.6 (4,736 reviews)
  • Comprehensive assortment of vinyl vacuum caps in various sizes.
  • Universal fit for capping off unused vacuum ports and lines.
  • Color-coded for easy identification of different sizes.
  • Made from durable vinyl material to resist heat and chemicals.

$6.47

03
Outus 20 Pcs Tire Valve Stem Caps Car Tire Caps Plastic Universal Black Valve Stem Covers for Bike Bicycle Cars SUV Trucks Motorcycles (Black)

Outus 20 Pcs Tire Valve Stem Caps Car Tire Caps Plastic Universal Black Valve Stem Covers for Bike Bicycle Cars SUV Trucks Motorcycles (Black)

Outus

4.7 (1,965 reviews)
  • Economical pack of 20 universal plastic valve stem caps.
  • Protects valve stems from dirt, dust, and moisture.
  • Lightweight and easy to install on all standard Schrader valves.
  • Suitable for cars, SUVs, trucks, motorcycles, and bicycles.

$3.75

04
(30 Pack) Tire Stem Valve Caps, with O Rubber Ring, Universal Stem Covers for Cars, SUVs, Bike and Bicycle, Trucks, Motorcycles, Airtight Seal Heavy Duty (Black (30 Pack))

(30 Pack) Tire Stem Valve Caps, with O Rubber Ring, Universal Stem Covers for Cars, SUVs, Bike and Bicycle, Trucks, Motorcycles, Airtight Seal Heav...

Unbranded

4.7 (1,060 reviews)
  • Heavy-duty construction for enhanced durability and security.
  • Includes internal O-rubber rings for an airtight, leak-proof seal.
  • Large quantity (30 pack) ensures you always have spares.
  • Universal application across various vehicle types, including heavy trucks.

$3.99

05
48 Pcs Automotive Cap Plugs Kit 0.11" to 2.39" Fit for AutoLine Pro, Autool, MR CARTOOL, OTC, Plastic Tapered Wide Thick Flange Hose Caps

48 Pcs Automotive Cap Plugs Kit 0.11" to 2.39" Fit for AutoLine Pro, Autool, MR CARTOOL, OTC, Plastic Tapered Wide Thick Flange Hose Caps

AutoLine Pro

4.3 (3,866 reviews)
  • Extensive 48-piece kit covering a wide range of sizes (0.11" to 2.39").
  • Tapered design with wide, thick flanges for secure fit and easy removal.
  • Essential for capping off hoses during automotive diagnostics and repairs.
  • Compatible with professional tools like AutoLine Pro, Autool, and OTC.

$27.89

06
50 Pcs Automotive Cap Plugs Kit 0.11" to 0.53" Fit for AutoLine Pro, Autool, MR CARTOOL, OTC, Plastic Tapered Wide Thick Flange Hose Caps

50 Pcs Automotive Cap Plugs Kit 0.11" to 0.53" Fit for AutoLine Pro, Autool, MR CARTOOL, OTC, Plastic Tapered Wide Thick Flange Hose Caps

AutoLine Pro

3.8 (2,417 reviews)
  • High-volume 50-piece kit focused on smaller cap plug sizes (0.11" to 0.53").
  • Ideal for sealing small vacuum lines, brake bleeders, and fluid ports.
  • Durable plastic construction designed for temporary or permanent sealing.
  • Tapered shape ensures a snug fit across various hose diameters.

$19.99

07
Tire Valve Stem Cap Cover - (5 Pack) Tire Air Cap Metal with Plastic Liner Corrosion Resistant Leak-Proof American Flag for Car Truck Motorcycle Bike Black

Tire Valve Stem Cap Cover - (5 Pack) Tire Air Cap Metal with Plastic Liner Corrosion Resistant Leak-Proof American Flag for Car Truck Motorcycle Bi...

American Flag

4.8 (1,041 reviews)
  • Premium metal exterior with a patriotic American Flag design.
  • Features a plastic liner to prevent corrosion and seizing onto the valve stem.
  • Leak-proof design helps maintain optimal tire pressure.
  • Stylish replacement caps for cars, trucks, motorcycles, and bikes.

$6.99

08
Gas Cap, Fuel Cap for 2012-2020 Nissan Infiniti Altima Frontier Murano Pathfinder Versa Note Infiniti QX60 JX35, 17251-1VZ0D, 17251-3JA0A, 17251-9BD0E, 2012 2013 2014 2015 2016 2017 2018 2019 2020

Gas Cap, Fuel Cap for 2012-2020 Nissan Infiniti Altima Frontier Murano Pathfinder Versa Note Infiniti QX60 JX35, 17251-1VZ0D, 17251-3JA0A, 17251-9B...

Gas

4.5 (142 reviews)
  • Direct replacement fuel cap for specific Nissan and Infiniti models (2012-2020).
  • Prevents fuel evaporation and triggers related to the EVAP system (Check Engine Light).
  • Meets or exceeds OEM specifications for a perfect fit and seal.
  • Easy, screw-on installation without the need for specialized tools.

$9.99

09
Diesel Fuel Cap & DEF lid for 2019-2024 Ram-Magnetic Diesel Lid for 2019 2020 2021 2022 2023 2024 Ram 1500 2500 3500 Green Aluminum Automotive Fuel Tank Cap Replacement Ram Accessories,Diesel+DEF cap

Diesel Fuel Cap & DEF lid for 2019-2024 Ram-Magnetic Diesel Lid for 2019 2020 2021 2022 2023 2024 Ram 1500 2500 3500 Green Aluminum Automotive Fuel...

Ram

4.6 (1,540 reviews)
  • Designed specifically for 2019-2024 Ram Diesel trucks (1500, 2500, 3500).
  • Includes both a magnetic diesel fuel cap and a DEF lid for complete coverage.
  • Constructed from durable, corrosion-resistant green aluminum.
  • Magnetic base allows the cap to stick securely to the fuel door during refueling.

$31.95

10
Dorman 54374 Air Conditioning Service Port Caps Compatible with Select Models, 2 Pack

Dorman 54374 Air Conditioning Service Port Caps Compatible with Select Models, 2 Pack

Dorman

4.4 (553 reviews)
  • Replacement caps for R134a air conditioning service ports (high and low side).
  • Ensures the AC system remains sealed and protected from contaminants.
  • Compatible with select vehicle models (check fitment before purchase).
  • Durable construction designed to withstand high pressure and temperature changes.

$8.24

Frequently Asked Questions

Why is my 'Check Engine' light on after losing my gas cap?

A loose or missing gas cap is one of the most common reasons for the 'Check Engine' light to illuminate. The gas cap is a vital part of the Evaporative Emission Control (EVAP) system, which prevents fuel vapors from escaping. If the cap is missing or doesn't seal properly, the system detects a leak, triggering the warning light. Replacing it with a compatible, airtight cap (like the Nissan/Infiniti replacement) should resolve the issue.

Do tire valve stem caps really prevent air leaks?

While the valve core itself is the primary seal, a good valve stem cap provides a crucial secondary seal. High-quality caps with internal rubber O-rings (like those in the 30-pack listing) are designed to be airtight, preventing slow leaks and protecting the delicate valve core from dirt, moisture, and road debris which can cause corrosion and future leaks.

What are automotive cap plugs used for?

Automotive cap plugs (like the 48 Pcs Cap Plugs Kit) are primarily used by mechanics to temporarily or permanently seal off hoses, lines, and ports during maintenance, testing, or repair. They are essential for pressure testing systems, preventing fluid leaks, or capping vacuum lines that are no longer in use.

Are metal valve caps better than plastic ones?

Metal caps are generally more durable and offer a premium look. However, if they lack a plastic or rubber liner (like the American Flag metal caps), they can sometimes corrode or seize onto the brass valve stem, making them very difficult to remove. High-quality plastic or metal caps with internal seals are both effective at preventing leaks.

Final Thoughts

Investing in quality automotive replacement caps is a simple, low-cost way to protect vital systems in your vehicle, from maintaining correct tire pressure to ensuring your emissions system functions correctly. Review our selection of the best tire, fuel, vacuum, and service port caps today to find the perfect match for your maintenance needs. Click on the products above to secure the airtight seal and protection your vehicle deserves!