Includes: D51844 O-Ring Rebuild Kit x 1, 647956-00 Trigger Valve Assembly x 1.
Trigger Valve Assembly: Part numbers 647956-00, 64795600, 641011-00, 647620-00
Compatible with DeWalt Models: D51844, D51822, D51845, D51823.
Replacement Parts For: D51256, D51321, D51430, D51431, D51276, D51822 Framing Nailers.

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.
Easy to replace and make your nailers work like new again.