1/2" Npt Threaded 200 PSI High cfm air compressor/tank pressure safety relief valve. Also known as a "Pop-Off" or "Blow Off" valve. This relief valve is manufactured in the United States and is stamped with "uv" & "nb" symbols. The relief pressure of this valve is set at 200 psi and is accurate within + or - 3% of the set pressure. Specifications: This valve will relieve 363 scfm Valve Inlet Threads: 1/2" Male npt (measure about 3/4" in diameter) Total Valve Length: 2-3/4" Installation Wrench Size: 7/8" Features a silicone rubber soft seat relief valve to prevent leaks Max temperature: 250° Solid Brass Construction Manufactured by Conrader