AeroPro AP-58 Trigger Valve Assembly fits Hitachi NR83A, NR83A2, NR83A2S Framing Nailers.The whole assembly includes: 875-644 Valve Plate,877-335 Trigger Valve Bushing,878-121 Trigger Plunger,878-734 Valve Packing,875-645R Rubber Ball,874-820 Plunger O-Ring,875-638 O-Ring Fits Hitachi NR83A / A2 / A2S includes: 875-644 Valve Plate,877-335 Trigger Valve Bushing,878-121 Trigger Plunger,878-734 Valve Packing,875-645R Rubber Ball,874-820 Plunger O-Ring,875-638 O-Ring Size Small Brand Name AeroPro Unit Count 1.0 Count Valve Type Air Control Valve Item Weight 0.5 Ounces Thread Size 1/4 Thread Type NPT Manufacturer AeroPro Model Number AP-58 Material Type Aluminum Connector Type Threaded Exterior Finish Aluminum Item Dimensions 3.5 x 0.2 x 3 inches Number of Ports 2 Number of Pieces 7 Inlet Connection Type 1/4 NPT