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Home >> Buick >> 1973 >> Centurion 2D Convertible >> Repair and Diagnosis >> Engine Mechanical >> Auxiliary Emission Control Systems >> Air Injection >> Operation >> Check Valve

Check Valve

Valve has a one-way diaphragm which prevents hot exhaust gases from backing up into the hose and pump. Valve protects system in case of pump belt failure, high exhaust system pressure, or air hose ruptures.