Rick's Free Auto Repair Advice

Posts Tagged: tire cap

Valve stem caps — Why they’re important

Valve stem caps Valve stem caps perform double duty by keeping dirt out of the valve core and by preventing air loss if you do have a small piece of dirt lodged in the valve core seal. What is a valve stem core? The valve stem core screws into the valve stem. It has a spring-tensioned plunger and a neoprene valve seal. When you press an air chuck against the plunger, it opens the valve and allows you to add or remove air. However, if there’s dirt surrounding the plunger, … Read More


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