Senco BF0203 and BF0204Aftermarket Parts for Senco Senco Part # BF0203 and BF0204 Available Qty: 15AC0141 O-ring GasketAC0141 O-ring Gasket Aftermarket O-ring Correct size and Thickness This is NOT Preformed like the OEM Gasket. Available Qty: 25Senco CF0015 Exhaust Valve + BF0204 Piston RetainerAftermarket parts for Senco FramePro's (NOT 601/602/652) and SCN60 SCN65 Part # CF0015 and BF0204Available Qty: 10 Post navigation LOTS of hard to find Senco Parts williamh_24076 O-ring Central