TOP 10 TOP RATED AUTOMOTIVE REPLACEMENT CAPS

Top Rated Automotive Replacement Caps for Every Need

Find the best automotive replacement caps, including vacuum hose caps, radiator caps, and wheel center caps. High-quality parts for your car's maintenance and repair.

Whether you're performing routine maintenance, tackling a complex engine repair, or just looking to refresh your vehicle's appearance, having the right replacement caps is crucial. Automotive caps, from vacuum plugs to radiator caps, play vital roles in maintaining system integrity, preventing leaks, and protecting components from dirt and moisture.

We've compiled a list of the top-rated and most essential automotive replacement caps available, focusing on quality, durability, and user satisfaction. This guide covers everything from comprehensive rubber cap assortments for vacuum lines and carburetors to specific radiator and wheel hub caps, ensuring you find the perfect fit for your vehicle.

Explore our selection to find reliable, high-performance caps that meet the rigorous demands of modern automotive systems and keep your car running smoothly.

01
80PCS Vacuum Hose Caps, Connector Assortment 6 Sizes Black Rubber Cap, Automotive Topomatic Replacement Parts for Carburetor Vacuum Plugs, Intake Manifold Vacuum Fitting

80PCS Vacuum Hose Caps, Connector Assortment 6 Sizes Black Rubber Cap, Automotive Topomatic Replacement Parts for Carburetor Vacuum Plugs, Intake M...

Topomatic

4.7 (523 reviews)
  • Comprehensive 80-piece assortment for various vacuum applications.
  • Includes 6 popular sizes for carburetor and intake manifold plugs.
  • Made from durable black rubber for excellent sealing and longevity.
  • Essential kit for mechanics and DIY enthusiasts working on vacuum systems.
02
ACDelco GM Original Equipment RC27 (10409635) Radiator Fill Cap

ACDelco GM Original Equipment RC27 (10409635) Radiator Fill Cap

ACDelco

4.7 (4,735 reviews)
  • GM Original Equipment part ensuring precise fit and function.
  • Maintains proper coolant pressure for optimal engine temperature.
  • Durable construction designed to resist heat and vibration.
  • ACDelco RC27 model, a trusted replacement for many GM vehicles.
03
Dorman 47397 Vinyl Color Vacuum Cap Assortment Universal Fit

Dorman 47397 Vinyl Color Vacuum Cap Assortment Universal Fit

Dorman

4.6 (1,580 reviews)
  • Color-coded vinyl caps for easy identification of sizes.
  • Universal fit designed for blocking off various vacuum ports.
  • Resistant to oil, gasoline, and engine heat.
  • Ideal for carburetor tuning, emissions equipment, and manifold plugging.
04
143 Pcs Rubber Vacuum Caps Assortment, 15 Sizes Rubber Caps, Hose End Caps for Carburetor, Manifold, Automotive 1/8" 1/4" 5/32" 3/16" 5/16" 7/32" 3/8" 1/2" 5/8"

143 Pcs Rubber Vacuum Caps Assortment, 15 Sizes Rubber Caps, Hose End Caps for Carburetor, Manifold, Automotive 1/8" 1/4" 5/32" 3/16" 5/16" 7/32" 3...

143

4.7 (4 reviews)
  • Massive 143-piece kit covering 15 different rubber cap sizes.
  • High-quality rubber construction ensures a tight, reliable seal.
  • Suitable for a wide range of automotive vacuum lines and fittings.
  • Comes in a compartmentalized storage case for organization.
05
Chrome Replacement Cap for EZ Lube Open End Plus Plug Center Caps

Chrome Replacement Cap for EZ Lube Open End Plus Plug Center Caps

Chrome

4.2 (122 reviews)
  • Stylish chrome finish for an enhanced wheel appearance.
  • Specifically designed as a replacement cap for EZ Lube center plugs.
  • Protects wheel bearings and grease fittings from contaminants.
  • Easy snap-in installation for quick replacement.
06
12 PCS Car Brake Bleeder Screw Caps, Rubber Caliper Nipple Waterproof Dust Stem Covers, Universal Auto Grease Zerk Fitting Cap Replacement for Cars, Motorcycles, Bicycles

12 PCS Car Brake Bleeder Screw Caps, Rubber Caliper Nipple Waterproof Dust Stem Covers, Universal Auto Grease Zerk Fitting Cap Replacement for Cars...

12

4.5 (10 reviews)
  • Protects brake bleeder screws and grease zerks from dirt and moisture.
  • Made from durable, waterproof rubber material.
  • Universal fit for cars, motorcycles, bicycles, and other applications.
  • Prevents corrosion and ensures easy future brake bleeding.
07
4 Pcs Hub Caps, 60mm Wheel Center Caps Rim Hub Replacement Center Covers Universal ABS Snap in Wheel Center Hubcaps Plastic Polished Surface for Rims Most Cars Car Accessory Wheel Hubs (Silver)

4 Pcs Hub Caps, 60mm Wheel Center Caps Rim Hub Replacement Center Covers Universal ABS Snap in Wheel Center Hubcaps Plastic Polished Surface for Ri...

4

3.8 (47 reviews)
  • Set of 4 universal 60mm wheel center hub caps.
  • Constructed from durable ABS plastic with a polished silver surface.
  • Snap-in design allows for quick and secure installation.
  • Refreshes the look of rims by replacing damaged or missing center covers.
08
Fuel Matte Black Custom Wheel Center Cap ONE (1) M-447, 1001-58

Fuel Matte Black Custom Wheel Center Cap ONE (1) M-447, 1001-58

Fuel

4.7 (383 reviews)
  • Genuine Fuel Off-Road replacement wheel center cap.
  • Features a sleek, durable matte black finish.
  • Specific part number (M-447, 1001-58) ensures compatibility with Fuel wheels.
  • High rating from users for quality and perfect fit.
09
Dorman 41050: Black Rubber Vacuum Cap Assortment

Dorman 41050: Black Rubber Vacuum Cap Assortment

Dorman

4.6 (526 reviews)
  • Trusted Dorman quality, known for reliable automotive parts.
  • Assortment of black rubber caps for various vacuum lines and fittings.
  • Resistant to high temperatures and automotive fluids.
  • Essential for sealing unused vacuum ports during engine work.
10
4Pcs Car 2 Pin Plug Replacement Weather Caps Auto Covers Caps Lid Top For Power Solar Automotive

4Pcs Car 2 Pin Plug Replacement Weather Caps Auto Covers Caps Lid Top For Power Solar Automotive

Unbranded

5.0 (3,710 reviews)
  • Designed to protect 2-pin electrical plugs from environmental damage.
  • Provides waterproof and dustproof sealing for automotive connectors.
  • Ideal for power, solar, and general automotive wiring applications.
  • Durable rubber construction ensures long-term weather resistance.

Guide to Choosing the Right Automotive Replacement Caps

Identify the Cap Type and Function

Automotive caps serve diverse purposes. Vacuum caps (like Dorman or 80PCS Assortments) are crucial for sealing off unused vacuum ports to maintain engine performance. Radiator caps (like the ACDelco RC27) are pressure-regulating devices essential for cooling system efficiency. Wheel caps (like Fuel or generic Hub Caps) are primarily cosmetic and protective, shielding hubs and bearings from debris. Always confirm the specific function required before purchasing.

Material and Durability

Caps exposed to engine heat, fluids, or high pressure (like vacuum and radiator caps) must be made from high-quality, heat-resistant materials such as EPDM rubber, silicone, or durable plastic/metal alloys. For exterior caps (like wheel hubs), focus on UV resistance and robust plastic or chrome finishes to withstand weather and road debris.

Fitment and Size Specificity

Precision is key, especially for functional caps. Radiator caps require the correct pressure rating (PSI) and neck size. Vacuum caps must match the hose or port diameter exactly (e.g., 1/8", 3/16"). For wheel center caps, measure the outside diameter (OD) and the clip-to-clip diameter (usually in millimeters) to ensure a secure snap-in fit. Universal assortments are excellent for DIY needs, but specific functional caps often require OEM or exact match replacements.

Assortment vs. Individual Caps

If you frequently work on older or multiple vehicles, a large assortment (like the 143 Pcs Rubber Vacuum Caps set) offers great value and flexibility for various repairs. If you only need to replace a single, critical component (like a radiator cap or a specific wheel cap), buying a single, high-quality OEM or brand-specific replacement is the best choice for guaranteed performance.

Frequently Asked Questions

Why are vacuum caps important for engine performance?

Vacuum caps seal off unused vacuum ports on components like carburetors or intake manifolds. If a cap is cracked or missing, it creates a vacuum leak, leading to poor idle, rough running, decreased fuel economy, and potential check engine lights.

How do I know if my radiator cap needs replacing?

Signs include coolant leaks around the cap, overheating, a collapsed radiator hose (indicating a vacuum issue), or the cap failing to hold pressure. Radiator caps should generally be replaced every few years as the seals and springs wear out.

Are wheel center caps universal?

No, while some generic hub caps come in common sizes (like 60mm), most are specific to the wheel brand and model. You must measure the diameter of the wheel opening and the clip size to ensure a proper, secure fit.

What is the difference between rubber and vinyl vacuum caps?

Rubber caps (like those from Dorman) generally offer superior resistance to high heat and are more flexible and durable for engine bay applications. Vinyl caps are often less expensive and suitable for less demanding, lower-heat applications.

Final Thoughts

Investing in high-quality replacement caps is a simple yet essential step in maintaining your vehicle's performance and appearance. From ensuring your engine's vacuum integrity with reliable rubber caps to protecting your cooling system with a proper radiator cap, the right replacement part makes all the difference. Browse our top-rated selection today and secure the components you need for a successful repair.