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Reference Information

Exhaust Check Valve, 3/4 in. NPT Thread Size, Steel, Natural, Jeep, 2.8L, Each

Crown Automotive exhaust check valves prevent exhaust from forcing its way back through the air injection system, which would damage the pump and other components. If your original parts are bad, they will be unable to sense the increase in the intake manifold vacuum and may cause damage to the cylinder head, pistons, and cylinder bores.