Only available in the SquareOvhKit. The black o-ring is ALREADY installed on the small black valve. See 'Extra Details' tab above. Click here to view installation video.  Extra Details

Old Part Numbers: S137-0001Air pressure knob for belt-driven air compressors. Replace if broken or cracked. Make sure your spring is still there under the knob.  This part is only the knob. If you need the complete kit order the SquareOvhKit. The...

Old Part Numbers: S137-0001This complete overhaul kit for an air compressor regulator includes knob, spring, and internal assembly. Click here for installation instructions. Note: Does not include a check valve, pressure switch, or safety valve...

Old Part Numbers: CTD1238, CTD1238SHORT, PN4671, 4480-CR1/2" Compression X 3/8" MPT with 1/8" FPT side 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...

1/4" NPT wingnut drain cock. Prevent rust from ruining your air compressor tank by draining your tank daily. Keep an extra around for a spare.Extra DetailsThis was a new check valve installed less than a year ago. Due to the tanks not being drained, this...