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What is a Valve Core?

September 18th, 2020

First time Slime sealant users not only learn about the benefits that tyre sealant has to offer, they also sometimes learn a bit about the make-up of their tyres and valves.

On many an occasion, a new user gets to the step in our instructions that asks them to remove the valve core and there is a pause as they ponder, “What is a valve core?” If this is you, do not worry! Many, many first time Slime sealant users have asked this same question.

The valve core is a small metal piece that threads inside your tyre valve stem. It consists of a seal attached to a movable, spring-loaded pin. You can see the pin sticking out of the valve stem in the picture below. This valve core is screwed inside your tyre’s valve stem to prevent air loss. In fact, this valve core is literally all that is keeping your tyre inflated!

Valve Core Pin

When you need to remove air from your tyre, you can simply depress the pin to open the valve and bleed out air. Some tyre gauges have built in bleeder buttons, or you can use a pen, key or other small object to let air out of your tyre. When it is time to add air to your tyre, tyre inflators are designed to automatically depress the pin and open up the airway as you connect the air hose to the valve stem.

When it comes time to install Slime tire sealant into your tyres, valve cores are easy to remove, and just as easy to insert back into the valve stem. Simply use the Valve Core Removal tool in the black cap of your sealant bottle to screw out/in the valve core.

Valve Core Removal Tool in Slime Cap

Valve Core Removal Tool in Slime Sealant Cap












Congratulations, you are now an expert in valve cores!

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