Check Valve

The check valve is provided to prevent exhaust gas from flowing back into the air pump. When air pressure of the air pump is greater than that of the exhaust gas, it opens the valve and the air passes into the air injection manifold.

When the pressure of the exhaust gas exceeds the pump pressure for any reason (such as drive belt failure), the check valve will close immediately to prevent exhaust gas from entering the air pump, which could cause damage to the air supply hoses and/or air pump.