Powerex (91236671) Low Pressure Piston Ring Set for OPT100 Bare Oilless Reciprocating Pump
The 91236671 is a low pressure piston ring set used on the Powerex OPT-100 piston compressor pump.
The OPT100 utilizes two low pressure pistons that take one ring each. This includes one piston ring, so you would need to order one for each low pressure piston/cylinder.
Piston rings should be replaced every 10,000 hours on Powerex's oilless reciprocating air compressor pumps