PLEASE NOTE: 1/2" NPT MEASURES 0.850" OUTSIDE THREAD DIAMETER IN INCHES. 1/2" NPT, Mid Flow Lubricator / Oiler For Pneumatic Air Tools On Compressed Air Lines. 105 CFM Flow Rate 1/2" Female NPT Air Inlet port X 1/2" Female NPT Air Outlet port, 5oz Poly Bowl Will Hold 5 Fluid Ounces Of Air Tool Lubricant. 215 Max Input Pressure, 150 Max Output Pressure. Polycarbonate Bowl to view moisture levels You Can Control The Amount Of Oil Flow By Adjusting The Adjustment Screw On Top Of The Lubricator. This Unit Includes Wall Mounting Bracket For Easy Installation, Operating And Installation Instructions Also Included. Almost All Pneumatic Tools Perform Better When Lubricated With Oil. Injecting An Oil Mist Into The Air-Stream Which Powers Them Can Continuously Lubricate Valves, Cylinders, And Air Motors For Proper Operation And Long Service Life.