Piston Bumper for Hitachi NR83A, NR83A2, NR83A2(S) - 883-511, 878649, 877376. Precision machined, virgin high density (Standard Green Color) - PU material plastic framer bumper -- Compatible with: Hitachi NV65AC Coil Pallet Nailer, NR83A 3-1/4 inch Full Head Nailer, NR83AA 3-1/4 inch Clipped Head Framing Nailer, NV65AA Nailer, NV75A Nailer, NV83A 3-1/4 inch Full Head, Framing Coil Nailer WARNING: This product can expose you to chemicals which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www. P65Warnings. ca. gov.