Reliability Provin KT-SE-781 Aftermarket Replacement Part for the Senco KT-SE-781 O-Ring Kit This kit will fit the following nailers: Senco PC0781 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-SE-781 This is a brand new tool part and comes with manufacturers warranty.