O-Ring Rebuild Kits and 647956-00 Tirgger Valve Assembly for Framing Nailer Universal. Trigger Valve Assembly part number 647956-00 64795600 641011-00 647620-00. 647956-00 Replacement Parts for Framing Nailer D51256 D51321 D51430 D51431 D51276 D51822. Fits D51275 Type 1 Finish Nailer, D51855 Type 1 Coil Framing Nailer, D51321 Type 2 Coil Roofing Nailer, D51822 Type 4 Framing Nailer, D51844 Type 4 Framing Nailer, D51257K Type 1 16 GA Finish Nailer, D51257K Type 2 16 GA Finish Nailer, D51276K (Type 1) 15 Gauge 1" to 2-1/2" Finish Nailer, D51238K (Type 1) 2" 18 Ga Brad Nailer. A brand-new, unused, unopened, undamaged item in its original packaging.