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...

Only available in the SQUAREOVHKIT.

Air compressor check valve. 3/8" Comp x 1/2" MPT with 1/8" FPT side port.  The check valve is a one-way valve that prevents air from back-feeding from the air tank. If your unit has a hard time restarting when trying to cycle or your pressure switch...

Old Part Numbers: 60-4-61-4, 058-0017-MAT1/4" compression nut and sleeve. Order two, one for each end of the tube.

Old Part Numbers: SRV250115, 1229W-115Air compressor safety relief valve, 1/4" MPT, 115 PSI. If your valve leaks below the pressure listed on the side of the valve, replace this vital safety feature.Specifications MPT Inlet: 1/4 in. FPT Outlet: 3/8 in...

Old Part Numbers: SRV250135, 1229W-135Air compressor safety relief valve. If your valve leaks below the pressure listed on the side of the valve, replace this vital safety feature.Specifications MPT Inlet: 1/4 in. FPT Outlet: 3/8 in. Preset Setting: 135...

Air compressor compression adapter.Specifications 1/4" Compression x 1/8" MPT