Compatible models: Trigger and plunger valve kit suitable for NR83A NR83A2 NR83A2(S) NR83A3, SP-P2 trigger valve assembly part number is 877-335 875-638, SP-P3 plunger valve part number is 884-. Material: The plunger valve is made of brass, and the main body of the trigger valve is made of Metal material. It has good gloss and texture, sturdiness, moisture-proof and rust-proof, and is durable. Plunger Valve: The plunger valve assembly controls the movement of or piston within the nail , where compressed air pushes the driver forward to push the nail forward into the material. The plunger valve must seal effectively to maintain the air pressure required for proper nail actuation. Trigger Valve Assembly: The trigger valve assembly controls the flow of compressed air to the plunger valve and driver. The trigger opens the valve, allowing compressed air to flow into the plunger valve. The trigger must be pressed against the work surface before it is pulled. Note: Regular cleaning and lubrication can effectively maintain the normal operation of components and extend their service life. Colour:Photo Color Material:Metal Package Contents: 1set x Piston copper valve Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.