Superior Parts SP 877-368 Aftermarket Piston O-Ring (1AP-48) for Hitachi NR83A/AA/AA2 2pc/pk Compatible With Hitachi: 83AA2 Strip Nailer | NR65AK Strap-Tite Fastening System Strip Nailer | NR65AK(S) Short Magazine Strap-Tite Fastening System NR65AK2 Strip Nailer | NR83A 3-1/4" Full Head Nailer | NR83A2 Strip Nailer | NR83A2(S) Framing Nailer, Full Head, Plastic Strip Collation (without Depth Adjustment) NR83A3 Strip Nailer | NR83A3S Strip Nailer | NR83AA 3-1/4" Clipped head Framing Nailer | NR83AA2 3-1/4" Clipped head Framing Nailer | NR83AA3 Clipped Head Framing Nailer NR83AA4 3-1/4" Paper Collated Framing Nailer | NR90AC2 3-1/2" Full head Framing Nailer | NR90AC3 Full Head Framing Nailer | NV65AA Nailer | NV65AC Coil Pallet Nailer | NV75A Nailer NV75AG Coil Siding/Framing Nailer | NV83A 3-1/4" Full Head, Framing Coil Nailer | NV83A13 Nailer | NV83A2 Full Round Head Coil Nailer | NV83A3 Nailer | NV85AG Coil Siding/Framing Nailer.