![]() ![]() Check valves are designed to allow airflow in only one direction Schrader valve tubes require pressure on the inner pin to let air enter ![]() The pin in the center is a spring-loaded check valve that controls airflow in and out. Schrader valves (sometimes called American Valve, Auto Valve, or A/V) are often wrapped in rubber (when used on wheels) and the outer wall is threaded to accept a cap or pump head.
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