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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...

Only available in the SQUAREOVHKIT.