Trigger Valve Replacement Part Numbers: 647956-00, 64795600, 641011-00, 647620-00 O-Ring Replacement Part Numbers: D51822, D51823, D51844, D51845, Universal O-Ring Kit Type 1, 2, 3, 4, 5 High Compatibility: 647956-00 Framing Nailer Replacement Parts D51256 D51276 D51321 D51430 D51431 D51822 Compatible with D51238K (Type 1) 2 inch 18 Ga Brad Nailer, D51257K Type 1 16 GA Finish Nailer, D51257K Type 2 16 GA Finish Nailer, D51275 Type 1 Finishing Nailer, D51276K (Type 1) 15 gauge 2-1/2 inch Finishing Nailer, D51321 Type 2 Coil Roofing Nailer, D51822 Type 4 Framing Nailer, D51844 Type 4 Framing Nailer, D51855 Type 1 Coil Framing Nailer Made with high-quality components and built to meet strict standards. Wear-resistant, stable performance, long service life Color: As shown Material: Metal + Plastic Package Contents: 1 x O-Ring Rebuild Kit Note: This package includes only the items listed above. Other items are not included. Light reflection and display differences may cause slight variations in color between the image and the actual item. Measurement may vary by +/- 1-3 cm.