20 Best Missing Valve Stem Cap [2024]

Are you looking for the best Missing Valve Stem Cap? Based on expert reviews, we ranked them. We've listed our top-ranked picks, including the top-selling Missing Valve Stem Cap.

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1 Lucky Shot .40 Cal Casing Valve Stem Tire Cap | Bullet Style Round Tire Valve Stem Caps | Stem Tires... Lucky Shot .40 Cal Casing Valve Stem Tire Cap | Bullet Style Round Tire Valve Stem Caps | Stem...
2 JUSTTOP Car Tire Valve Stem Caps, 12pcs Air Caps Cover, Universal for Cars, SUVs, Bike, Trucks and... JUSTTOP Car Tire Valve Stem Caps, 12pcs Air Caps Cover, Universal for Cars, SUVs, Bike, Trucks...
3 CKAuto 50 Pack Tire Valve Caps, Plastic Valve Stem Caps with O Rubber Seal, Universal Stem Covers... CKAuto 50 Pack Tire Valve Caps, Plastic Valve Stem Caps with O Rubber Seal, Universal Stem Covers...
4 Valve Stem Caps, 4 Pack Universal Car Tire Valve Caps Wheel Rim Dust Cover fits Cars, Trucks, Bikes,... Valve Stem Caps, 4 Pack Universal Car Tire Valve Caps Wheel Rim Dust Cover fits Cars, Trucks,...
5 CKAuto Tire Valve Stem Caps, Red, 4 pcs/Pack, Anodized Aluminum Tire Valve Cap Set, Corrosion... CKAuto Tire Valve Stem Caps, Red, 4 pcs/Pack, Anodized Aluminum Tire Valve Cap Set, Corrosion...
6 SAMIKIVA (30 Pack) Tire Stem Valve Caps, with O Rubber Ring, Universal Stem Covers for Cars, SUVs,... SAMIKIVA (30 Pack) Tire Stem Valve Caps, with O Rubber Ring, Universal Stem Covers for Cars,...
7 AIEX 8 Packs Aluminum Tire Valve Stem Caps with Gasket Universal Hexagon Valve Covers Replacement... AIEX 8 Packs Aluminum Tire Valve Stem Caps with Gasket Universal Hexagon Valve Covers Replacement...
8 Valve-Loc Tire Valve Caps (25-Pack) Black, Universal Stem Covers for Cars, SUVs, Bike and Bicycle,... Valve-Loc Tire Valve Caps (25-Pack) Black, Universal Stem Covers for Cars, SUVs, Bike and...
9 HZJD 25PCS Tire Valve Caps, with O Rubber Ring, Universal Stem Covers for SUVs, Cars, Bike,... HZJD 25PCS Tire Valve Caps, with O Rubber Ring, Universal Stem Covers for SUVs, Cars, Bike,...
10 Dsycar 8 Pack Locking Tire Valve Caps , Anti Theft Design ,with O Rubber Ring, Universal Aluminum... Dsycar 8 Pack Locking Tire Valve Caps , Anti Theft Design ,with O Rubber Ring, Universal Aluminum...
11 Brass (8 Pack) Tire Valve Caps Silver, Premium Metal Rubber Seal Tire Valve Stem Caps, Dust Proof... Brass (8 Pack) Tire Valve Caps Silver, Premium Metal Rubber Seal Tire Valve Stem Caps, Dust Proof...
12 CamelBak Eddy Kids BPA Free Water Bottle 12 oz, Glitter UFOs CamelBak Eddy Kids BPA Free Water Bottle 12 oz, Glitter UFOs
13 OGE Presta Valve Caps Black,Plastic Bike Dust Caps Tire - Bicycle Presta/French Valve stem Cover for... OGE Presta Valve Caps Black,Plastic Bike Dust Caps Tire - Bicycle Presta/French Valve stem Cover...
14 Car Tire Valve Stem Caps, 12pcs Luminous Air Caps Cover, Universal for Cars, SUVs, Bike, Trucks and... Car Tire Valve Stem Caps, 12pcs Luminous Air Caps Cover, Universal for Cars, SUVs, Bike, Trucks...
15 JUSTTOP 4PCS Car Tire Valve Stem Caps, Air Caps Cover, Universal for Cars, SUVs, Bike, Trucks and... JUSTTOP 4PCS Car Tire Valve Stem Caps, Air Caps Cover, Universal for Cars, SUVs, Bike, Trucks and...
16 MOTOALL 10Pcs Plastic Black Tire Wheel Valve Stem Valve Cover Caps for TR20008 TPMS, Universal Stem... MOTOALL 10Pcs Plastic Black Tire Wheel Valve Stem Valve Cover Caps for TR20008 TPMS, Universal...
17 American Flag Tire Valve Stem Caps, 8 Pcs Anti-Theft Premium Metal Rubber Seal Tire Valve Caps,... American Flag Tire Valve Stem Caps, 8 Pcs Anti-Theft Premium Metal Rubber Seal Tire Valve Caps,...
18 Tire Valve Caps (12 Pack) Heavy-Duty Stem Covers | Dust proof, with O Rubber Seal | Hexagon Design |... Tire Valve Caps (12 Pack) Heavy-Duty Stem Covers | Dust proof, with O Rubber Seal | Hexagon Design...
19 Valve-Loc Tire Valve Caps (10-Pack) Heavy-Duty Stem Covers | Dustproof, Airtight Seal | Hexagon... Valve-Loc Tire Valve Caps (10-Pack) Heavy-Duty Stem Covers | Dustproof, Airtight Seal | Hexagon...
SaleBestseller No. 1
Lucky Shot .40 Cal Casing Valve Stem Tire Cap | Bullet Style Round Tire Valve Stem Caps | Stem Tires...
  • Authentic Casings Tire Valve Stems: Our Tire Valve Stems Are Made From Genuine Once-Fired 40MM Casings and Keep Your Tires Inflated, Allowing You To...
  • Patent Insert Design: Our Patented Insert Protects Your TPMS Sensors from Damage. Easy to Install, No Tools Required. Our Caliber Valve Stem Tire Air...
  • High-Quality Tire Cap Coating: Each Valve Stem Cap Is Lacquer Coated to Help Prevent Tarnishing And Includes 2 License Plate Screws. The Tire Stem...
  • Perfect Fit: Our Nickel And Brass Valve Stem Fit Standard Schrader Valve Stem, Which Is Found On Most Cars, Trucks, Motorcycles, And SUV. The ATV...
  • Buy With Confidence: Backed with a 6-Month Workmanship Guarantee – Rest Assured You Are Getting an Original Top Quality Product. All Of Our Items...
SaleBestseller No. 2
JUSTTOP Car Tire Valve Stem Caps, 12pcs Air Caps Cover, Universal for Cars, SUVs, Bike, Trucks and...
  • Valve caps can protect the valve, prevent the water, dust or sand into the tire; preventing the valve from leaking, ensure the safe driving.
  • Easy to install, 12pcs valve stem caps, it's can easily tightened use your hand. Beautiful appearance, fits vehicles of various colors.
  • The valve cap is made of good quality and durable aluminum alloy, enhanced seal to help prevent air leakage.
  • Universal size fits more cars, bus trucks, SUVs, motorcycle, bike or bicycle.
  • Any issues or questions please feel free to contact us, we are always here to satisfy all of you.
Bestseller No. 3
CKAuto 50 Pack Tire Valve Caps, Plastic Valve Stem Caps with O Rubber Seal, Universal Stem Covers...
  • High Quality Material: The valve stem caps are made of durable plastic which can protect your valves from dirt and corrosion, heavy-duty and...
  • Large Quanity & Wide Usage: Package includes 50pcs valve caps which could meet your different purpose use, the universal size tire stem valve caps...
  • Airtight & Leakproof: The tire valve caps have an O Ring seal inside to prevent air leakage from the valve and make a better seal
  • Easy To Install: With Smart, Ergonomic Ridged Grip Design, these tire caps constructed well enough to screw on the tire valve stem easily; it is easy...
  • Dimension: 13 x 10mm/ 0.51" x 0.39" (L*D); Thread Hole Diameter : 8mm/ 0.31", 50pcs/Pack; If you have any quality issue about the products, please...
Bestseller No. 4
Valve Stem Caps, 4 Pack Universal Car Tire Valve Caps Wheel Rim Dust Cover fits Cars, Trucks, Bikes,...
  • High-quality Material - Made from aluminum and treated to withstand the elements, specifically for outdoor use. Anti-Rust can effectively prevent the...
  • Universal Fit -It is universal and will fit securely on any tire or wheel air valve stem. Perfect for any car, truck, SUV, motorcycle, bike or...
  • Easy to Install - With the simple and smooth shape and design our valve stem caps are easily hand tightened. Replace those old and missing tire valve...
  • Unique Design - The Car Logo on our valve stem caps is personalized, sleek design is highly attractive, yet understated to go perfectly with any wheel...
  • Quality Guarantee - If you have any problems, do not hesitate to contact us via email, we will reply within 24 hours and help you solve it.
Bestseller No. 5
CKAuto Tire Valve Stem Caps, Red, 4 pcs/Pack, Anodized Aluminum Tire Valve Cap Set, Corrosion...
  • Special Design – Metal materials are prone to rust in the presence of water and oxygen, which may lead to corrosion on valve body. The plastic inner...
  • Premium Material – CKAuto Valve Stem Caps are made of high-grade light-weight aluminum alloy, anodized & powder coated finish for maximum strength...
  • Easy to install – The design of the tire valve cap rotating thread makes it easy to twist when install or remove.
  • Wide Application – The inner diameter of tire valve caps is 7mm, and the inner height is 13.8mm, so the valve caps universal fit most cars,...
  • Why Choose CKAuto – CKAuto Valve Stem Caps address the challenge that some materials that may be desirable for an exterior of the valve cap can...
SaleBestseller No. 6
SAMIKIVA (30 Pack) Tire Stem Valve Caps, with O Rubber Ring, Universal Stem Covers for Cars, SUVs,...
  • O RUBBER RING - All dust caps for wheels has rubber rings, no air leaking on long, tough drives.
  • UNIVERSAL STEM TIRE VALVE CAPS - Fit for cars, SUVs, trucks, bikes, and other motor vehicles.
  • ESAY TO INSTALL - All tire valve caps has stripes around the top dome shape, easier to grab and tighten, more convenient.
  • High quality - More durable, more strong, are made of good quality plastic.
  • BEST AFTER-SALES - Good quality material, keep driving safe! If have any question, free to contact us, we will solve it at once!
Bestseller No. 7
AIEX 8 Packs Aluminum Tire Valve Stem Caps with Gasket Universal Hexagon Valve Covers Replacement...
  • Prime Quality: The hexagon tire caps are made of high quality aluminium alloy, shows beautiful color after electroplating. No worries of fading and...
  • No Burr on Surface: The surface of the aluminium alloy valve caps are processed with frosted technology, reduce product burr and provide comfort grip...
  • Widely Use: The tire valve caps perfectly fit on the valve stem of motorcycle, bicycle, cars, trucks, etc. Against exposure to dirt, grime and dust.
  • Excellent Sealing Effect: The valve stem cap with a rubber gasket inside can prevent air leaking perfectly. It can be threaded easily onto the valve...
  • Ideal Replacement: A great replacement for your missing valve stem caps, make your tire work more longer than ever. No more worries about low pressure...
SaleBestseller No. 8
Valve-Loc Tire Valve Caps (25-Pack) Black, Universal Stem Covers for Cars, SUVs, Bike and Bicycle,...
  • Universal Tire Stem Valve Caps – These dust covers for wheels help keep tires inflated at the proper level on bikes, cars, SUVs, trucks, and...
  • Airtight, Leakproof Seal – Valve-Loc tire valve caps feature rubber O-rings that create a tighter, more effective seal, so there’s no air...
  • Smart, Ergonomic Ridged Grip – Each car tire valve cap also has grips around each dome shape to make it easier to grab and tighten it with...
  • Complete Valve Stem Cover Pack – Every order comes with 25 individual Valve-Loc tire valve caps in every bag to cover all your automobiles...
  • Guaranteed Satisfaction – Valve-Loc products are not only weather-resistant, dustproof, and more durable, they’re backed by unbeatable...
Bestseller No. 9
HZJD 25PCS Tire Valve Caps, with O Rubber Ring, Universal Stem Covers for SUVs, Cars, Bike,...
  • 【DURABLE】Made of solid plastic, durable and well constructed, with anti-slip stripes on the surface of the valve cover dome, it’s effortlessly...
  • 【PRODUCT DESIGN】Light and Portable, Easy to Operation, Modern Design, Small Size, Easy to Carry, O RUBBER RING - All dust caps for wheels has...
  • 【EXTENSIVE USE】Designed to fit for cars, carts, trailers bikes, motorcycles and electric bikes, widely used in car repair shops and cap...
  • 【YOU WILL GET】25PCS Black, Tire Valve Caps, made of high-quality plastic, rain, snow and Can Prevent it From Being Corroded By Muddy Water, Extend...
  • 【100% SATISFACTION GUARANTEED】Customer satisfaction is our first priority, And we want you to be as thrilled about our products as we are, We...
Bestseller No. 10
Dsycar 8 Pack Locking Tire Valve Caps , Anti Theft Design ,with O Rubber Ring, Universal Aluminum...
  • COOL BULLET DESIGN: Bullet shape designed, a nice subtle detail that can be added to your vehicle.Replace the original cheap plastic valve caps, add...
  • PREMIUM MATERIALS: Dsycar valve stem caps are made of high-grade heavy duty aluminum alloy, anodized & powder coated finish for maximum strength and...
  • ANTI-THEFT DESIGN - If you find your valve caps are often loose or missing, you can buy Dsycar locking valve caps . This style of cap actually locks...
  • DUST PROOF, LEAK-PROOF AIR PROTECTION: Dsycar Tire Valve Stem Caps have a rubber washer to help make an airtight seal, protects from dirt and...
  • BEST PART, ZIPPER POUCH – Different with others, put the stem cap in a cheap bag. Our valve stem cover comes in a little zipper pouch. Not only to...
Bestseller No. 11
Brass (8 Pack) Tire Valve Caps Silver, Premium Metal Rubber Seal Tire Valve Stem Caps, Dust Proof...
  • Made of BRASS - Chrome Silver Metal, Strong, Dust proof, more durable.
  • RUBBER SEAL INSIDE - All dust caps for wheels has rubber rings, no air leaking on long, tough drives.
  • ESAY TO INSTALL - Hexagon shape, easier to grab and tighten, more convenient.
  • WIDE APPLICATION - Universal fit for Cars, SUVs, Bike and Bicycle, Trucks, Motorcycles.
  • BEST AFTER-SALES - Good quality material, keep driving safe! If have any question, free to contact us, we will solve it at once!
SaleBestseller No. 12
CamelBak Eddy Kids BPA Free Water Bottle 12 oz, Glitter UFOs
  • KIDS’ SPILL-PROOF WATER BOTTLE: The CamelBak Eddy 0.4-Liter Kids’ Water Bottle is specifically designed for smaller hands to use. It features...
  • JUST THE RIGHT BITE: This water bottle for kids combines the patented CamelBak Big Bite Valve with a stem tube and shut-off valve. This detachable...
  • BPA-FREE MATERIALS: The Eddy 12-ounce kids’ water bottle is made from Tritan plastic that is 100% free of BPA, BPS, and BPF. It’s dishwasher safe,...
  • COLORFUL AND PRACTICAL: CamelBak has developed this Eddy kids’ water bottle with a spill-resistant design and fun graphics to keep you and your kids...
Bestseller No. 13
OGE Presta Valve Caps Black,Plastic Bike Dust Caps Tire - Bicycle Presta/French Valve stem Cover for...
  • ✔ APPLICATION -Fits PRESTA/FRENCH valve stems.Replacement for your broken or missing valve stem caps , prevent chronic air leakage,...
  • ✔ LIGHTWEIGHT -Made of extremely light plastic, much more lighter than aluminum alloy.Make your riding on mountain roads easier and save...
  • ✔ WILL NOT BE CORRODED -The biggest advantage of plastic material is that it will not chemical react with your valve stems like aluminum...
  • ✔ EASY INSTALLATION -Installation only need screws it onto tire valve stem .Everyone can screw on it in seconds without any tools . It is...
  • ✔ 100% SATISFACTION -High-grade plastic will not be rusted or be oxidized, can be used in any weather . Quality assurance will make you 100%...
SaleBestseller No. 14
Car Tire Valve Stem Caps, 12pcs Luminous Air Caps Cover, Universal for Cars, SUVs, Bike, Trucks and...
  • Tire stem valves caps; Our valves caps are made of ABS, can light in the dark and protect the valve, prevent the water, dust or sand into the tire;...
  • Easy to install: 12pcs luminous valve stem caps can easily tightened use your hand. Beautiful appearance, fits vehicles of various colors
  • Wide compatibility: Universal size fits more cars, bus trucks, SUVs, motorcycle, bike or bicycle
  • Perfect gift: The luminous air caps cover is made of durable ABS and luminous powder that glows in the dark and looks very sleek and stylish. It's the...
  • Happy time: Imagine how happy it is for your car to use our luminous valve caps to shine brightly in the dark
SaleBestseller No. 15
JUSTTOP 4PCS Car Tire Valve Stem Caps, Air Caps Cover, Universal for Cars, SUVs, Bike, Trucks and...
  • Valve caps can protect the valve, prevent the water, dust or sand into the tire; preventing the valve from leaking, ensure the safe driving.
  • Easy to install, 12pcs valve stem caps, it's can easily tightened use your hand. Beautiful appearance, fits vehicles of various colors.
  • The valve cap is made of good quality and durable aluminum alloy, enhanced seal to help prevent air leakage.
  • Universal size fits more cars, bus trucks, SUVs, motorcycle, bike or bicycle.
  • Any issues or questions please feel free to contact us, we are always here to satisfy all of you.
Bestseller No. 16
MOTOALL 10Pcs Plastic Black Tire Wheel Valve Stem Valve Cover Caps for TR20008 TPMS, Universal Stem...
  • Designed for TR20008 TPMS Valves.
  • Package Includes: 10 Pieces TPMS Tire Valve Stem Caps
  • Black Tire Valve Stem Long Caps fit most cars, trucks, SUV, bikes and motorcycles that use schrader valve stems.
  • The black long stem caps not only prevents air loss, but also protects the tire valve from dirt and corrosion. The black long stem caps are waterproof...
SaleBestseller No. 17
American Flag Tire Valve Stem Caps, 8 Pcs Anti-Theft Premium Metal Rubber Seal Tire Valve Caps,...
  • High quality: This product is made of 100% alloy material, never rust, never fade, directly replace the original black plastic valve cover, from the...
  • Safety: Protect stem cap from corrosion caused by direct contact with clay, water and snow. The rubber sealing O-ring is built in the valve cap of...
  • Installation: Hexagonal design, just screw off the plastic cap of the original car and screw on the metal one. The valve stem cover is suitable for...
  • Expressing patriotism:The American flag designed tire valve cap is low-key, but still the perfect way to show your patriotism, support for...
  • After sales: Our products are high quality products, if you have any dissatisfaction. Please let us know in time, we will refund you unconditionally.
Bestseller No. 18
Tire Valve Caps (12 Pack) Heavy-Duty Stem Covers | Dust proof, with O Rubber Seal | Hexagon Design |...
  • RUBBER SEAL INSIDE - All dust caps for wheels has rubber rings, no air leaking on long, tough drives.
  • Made of Aluminum Alloy - Gun Gray Metal, Strong, Dust proof, more durable.
  • ESAY TO INSTALL - Hexagon shape, easier to grab and tighten, more convenient.
  • WIDE APPLICATION - Universal fit for Cars, SUVs, Bike and Bicycle, Trucks, Motorcycles.
  • Warning - Although these premium aluminum tire caps are anodized and durable, they can fuse to the tire valve stem if not cared for properly. Prior to...
SaleBestseller No. 19
Valve-Loc Tire Valve Caps (10-Pack) Heavy-Duty Stem Covers | Dustproof, Airtight Seal | Hexagon...
  • Complete Tire Valve Cap Set – This pack of aluminum, hexagon Valve-Loc stem caps offer heavy-duty protection to ensure stability and protection when...
  • Airtight Rubber O-Ring Seal – These cap tire valves provide an enhanced seal to help prevent air leakage and to properly keep out dust, dirt, grime...
  • Proper Stem Fit –Valve-Loc offers the best tire valve caps available today because every piece is custom-designed to lock on tight for a firm fit...
  • Versatile Application – Along with cars, trucks, SUVs, and RVs, these metal valve stem caps can be used on off-road bicycles, road bikes,...
  • Resealable Bag – Each 10-piece tire air valve cap set comes in a high-quality, closable bag to make it easier to store extra air valves in your...

Having trouble finding a great Missing Valve Stem Cap?

This problem is well understood by us because we have gone through the entire Missing Valve Stem Cap research process ourselves, which is why we have put together a comprehensive list of the best Missing Valve Stem Caps available in the market today.

After hours of searching and using all the models on the market, we have found the best Missing Valve Stem Cap for 2023. See our ranking below!

How Do You Buy The Best Missing Valve Stem Cap?

Do you get stressed out thinking about shopping for a great Missing Valve Stem Cap? Do doubts keep creeping into your mind?

We understand, because we’ve already gone through the whole process of researching Missing Valve Stem Cap, which is why we have assembled a comprehensive list of the greatest Missing Valve Stem Cap available in the current market. We’ve also come up with a list of questions that you probably have yourself.

John Harvards has done the best we can with our thoughts and recommendations, but it’s still crucial that you do thorough research on your own for Missing Valve Stem Cap that you consider buying. Your questions might include the following:

  • Is it worth buying an Missing Valve Stem Cap?
  • What benefits are there with buying an Missing Valve Stem Cap?
  • What factors deserve consideration when shopping for an effective Missing Valve Stem Cap?
  • Why is it crucial to invest in any Missing Valve Stem Cap, much less the best one?
  • Which Missing Valve Stem Cap are good in the current market?
  • Where can you find information like this about Missing Valve Stem Cap?

We’re convinced that you likely have far more questions than just these regarding Missing Valve Stem Cap, and the only real way to satisfy your need for knowledge is to get information from as many reputable online sources as you possibly can.

Potential sources can include buying guides for Missing Valve Stem Cap, rating websites, word-of-mouth testimonials, online forums, and product reviews. Thorough and mindful research is crucial to making sure you get your hands on the best-possible Missing Valve Stem Cap. Make sure that you are only using trustworthy and credible websites and sources.

John Harvards provides an Missing Valve Stem Cap buying guide, and the information is totally objective and authentic. We employ both AI and big data in proofreading the collected information.

How did we create this buying guide? We did it using a custom-created selection of algorithms that lets us manifest a top-10 list of the best available Missing Valve Stem Cap currently available on the market.

This technology we use to assemble our list depends on a variety of factors, including but not limited to the following:

  1. Brand Value: Every brand of Missing Valve Stem Cap has a value all its own. Most brands offer some sort of unique selling proposition that’s supposed to bring something different to the table than their competitors.
  2. Features: What bells and whistles matter for an Missing Valve Stem Cap?
  3. Specifications: How powerful they are can be measured.
  4. Product Value: This simply is how much bang for the buck you get from your Missing Valve Stem Cap.
  5. Customer Ratings: Number ratings grade Missing Valve Stem Cap objectively.
  6. Customer Reviews: Closely related to ratings, these paragraphs give you first-hand and detailed information from real-world users about their Missing Valve Stem Cap.
  7. Product Quality: You don’t always get what you pay for with an Missing Valve Stem Cap, sometimes less, and sometimes more.
  8. Product Reliability: How sturdy and durable an Missing Valve Stem Cap is should be an indication of how long it will work out for you.

John Harvards always remembers that maintaining Missing Valve Stem Cap information to stay current is a top priority, which is why we are constantly updating our websites. Learn more about us using online sources.

If you think that anything we present here regarding Missing Valve Stem Cap is irrelevant, incorrect, misleading, or erroneous, then please let us know promptly!

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FAQ:

Q: How to replace a valve stem?

A: Remove Tire. What you should do is find some flat ground and lay the tire down. After doing so you will need to break the bead. Remove the Old Valve Stem. Once you have gained access to the old valve stem you can remove it by cutting it or pulling it out with pliers. Lubrication/Glue. Next you have to use something will help the valve stem slide in place and when it dries you it should function like glue to prevent … Installing the Valve Stem. The installation process is straight forward. All you need to do is to put the stem trough the hoe and pull it trough. Tire Inflation. Now it is time to inflate the tire. But there is a problem is that since the bread was broken the tire will not hold pressure. Tools. I have in my care a tire kit that I bought from harbor freight tools. …

Q: What do you use for valve caps?

A: Valve caps are knurled to make it easier to tighten or loosen them, while some metal caps feature hex head designs. Metal caps use a rubber washer or o-ring to seal the valve completely. If the valve cap is missing, it is best to press the valve core momentarily to release a little air before checking or adding air pressure.

Q: Why are my valve stem caps green?

A: CARS.COM — Green caps on tire valve stems usually mean the tires are filled with nitrogen instead of ordinary oxygen. Car dealers, tire dealers, repair shops and even some gas stations have touted nitrogen for several years as a better alternative to air based on claims that nitrogen doesn’t leak as much, so tires stay fully inflated longer.

Q: How do you replace valve stem seals?

A: Push down on the compressor and carefully remove the split valve keepers. Take great care not drop the valve keepers into the engine. Remove the valve spring. Pull the old seal off the valve stem and replace it with a new valve seal. Place the valve spring that’s still in the spring compressor back onto the valve stem.