Compatible models:
Fits for Dewalt following models:
1/ 2, D51850 3 1/2, D51276 15, D51257 16, D51275 Type 1, D51855 Type 1, D51321 Type 2, D51822 Type 4, D51844 Type 4, D51257K Type 1/2 16 GA Finish Nailer, D51276K (Type 1) 15 Gauge 1" to 2-1/2" Finish Nailer, D51238K (Type 1) 2" 18 Ga Brad Nailer

Function:
The trigger valve works in conjunction with the top valve to trigger your nail gun when the trigger valve is pressed, it creates a difference in air pressure between the air reservoir and the cylinder, which causes the top valve to open, most triggering the piston wrench valve. A common problem is a failed o-ring on the inside, when this happens, air may leak from the trigger and the gun will not fire normally, replacing the trigger valve assembly has restored

Product material: plastic and rubber

Install:
1. Remove the pins from the nail gun
2. Pull open and remove the original trigger valve
3. Apply a small amount of grease on the O-ring, insert it to fix it, and check it

The package includes:
1* Trigger valve
1 set of O-rings