This listing is for a brand new (MADE IN THE USA) air compressor manifold valve with relief. This valve has 1/2" male NPT threads that screw into the tank (1/2" male threads measure about 3/4" in diamter). This valve is a great replacement option for a damaged or worn out valve. This will also work great if you're building an air compressor or fixing one and the tank has minimal hook-ups. New Air Compressor manifold. Built in Ball Valve & safety relief valve set at 130 PSI. 1/2" Male NPT inlet x 1/4" Female NPT outlet Gauge port 1/4" MADE IN THE USA -1/4" Female NPT Port for a Pressure Gauge. - 1/4" Female NPT Port for an Air Hose or Coupler Connection. - 1/4" Male NPT thread on the top for a pressure switch control valve. (Note:1/4" NPT pipe measures about 1/2" in diameter) · Applications: Suitable for Compressors 3 Hp & Smaller · Features Forged Brass Body, Easy Use Shut Off Lever (Ball Valve Type Design w/Stop and Loaded Teflon Seal Which Prevents Leakage) and Stainless Steel Springs · Includes Pressure Switch Mount & Tank Pressure Gauge Port Which Allows All Control & Outlet Functions to Be Connected to the 1/2” NPT Tank Port · Maximum Temperature: 450ºF Please contact us if you need more than one. We offer discount on higher quantities.