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 High Compatibility: Compatible with D51238K (Type 1) 2 inch 18 Ga Nailer, D51257K Type 1 16 GA Nailer, D51257K Type 2 16 GA 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 strict standards. Resists wear, delivers stable performance, and offers long service life Color: As Shown Material: Metal + Plastic Package Contents: 1 x O-Ring Rebuild Kit Content limited to items listed above; other products not included Note: Lighting and display differences may cause slight color variations between image and actual item. Measurement may vary by +/- 1-3 cm