Check Valve, 1/2" Compression x 1/2" MPT, Large Port #01B229

Long check valve for air compressors. Measures 1/2" Compression x 1/2" MPT (measures 3/4" Outside Diameter) with a 1/8" FPT Unloader Relief Valve line port. 

• If the small unloader (bleeder) valve on or under your switch leaks constantly AFTER the unit shuts off, replace this part. The check valve is a one-way valve that prevents air from backfeeding from the air tank.