SP-P1 Plunger Valve Assembly for Hitachi NR83A Framing Nailer Parts. SP-P1 is Compatible with: Hitachi NR83A, Air Locker AL83, Spotnails NPR90, Supco SDF-88, Amigo's NR83, Pneu Tools SN2283H. Package Includes: as images show, SP 875-643 Compression Spring, SP 874-436 Aftermarket O-Ring, SP 884-113 Aftermarket Trigger Plunger (SP 877-338), SP 875-638 Aftermarket O-Ring, SP 877-337 Aftermarket Trigger Valve Stem, SP 877-339 Aftermarket Plunger (B). These parts install quickly to make your nailer work like new again. A brand-new, unused, unopened, undamaged item in its original packaging.