100 PSI 1/2" Male NPT Air Compressor Pressure Relief Safety Pop Off ValveBrand new, certified 1 2" NPT Threaded 100 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 100 PSI and is accurate within + or 3% of the set pressure. Specifications: This valve will relieve 193 SCFM Valve Inlet Threads: 1 2" Male NPT (measures about 3