Part Numbers:Complete Rebuild Kit for Hitachi NV45AB / NV45AB2 Package Includes: all the o-rings plus, the feed piston O-rings, the trigger valve O-rings, Valve Pak, Poly Trigger Ball, Feeder Spring, Gasket (F) 883892, Gasket (E) 877767 O-Ring Kit With Extras Coil Roofing Nailer A brand-new, unused, unopened, undamaged item in its original packaging. Return refund: If you have any questions, you can refund in full without any problems.