Reliability Provin KT-BO-650 Aftermarket Replacement Part for the Bostitch KT-BO-650 O-Ring Kit This kit will fit the following nailers: Bostitch N65CP 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-BO-650 This is a brand new tool part and comes with manufacturers warranty.