Porter Cable FN250A Series O-Ring Rebuild Kit - Aftermarket Replacement Reliability Provin KT-PC-250 Aftermarket Replacement Part for the Porter Cable FN250A Nailer This kit will fit the following nailers: Porter Cable FN250A Includes: All the o-rings in the tool. Instructions with a schematic of the tool. O-Rings are color coded to aid installation. Manufacturer: Reliability Provin Part Number: KT-PC-250 This is a brand new tool part and comes with manufacturers warranty.