Air compressor pressure switch. Rated for 105/135 PSI (cut-on and cut-off), 4-port manifold with 90-degree unloader valve on bottom. Replace the pressure switch if the compressor no longer cuts in or cuts out at the designated pressure (PSI), if the unit...

1-1/2 Npsm X 1/4 Npt.  NOTE: Also order the 513-0002 o-ring seal to complete the repair.

1/2" MPT thread.