Pilot/unloader Assby.
Coleman Sanborn Oil-Bath Electric Air Compressor Parts
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Price: $100.65
Found under the following brands:
Conrader
New brass style unlodaer valve. 1/2" FPT Inlet, 1/2" FPT outlet. Pilot valve/check valve/unloader valve. The brains of your compressor. Tells motor when to idle and go to full throttle. Unloads pump @ 135 psi.