Description
Air compressor check valve, 1/2" Compression x 1/2" MPT with 1/8" hole; plug hole if not needed. https://mastertoolrepair.com/1-8-blk-steel-plug-s-h-100b6e/
If the small unloader (bleeder) valve on or under your pressure 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.