Uniweld G2S 2-Inch Gauge 0-30 PSI Gold Steel Case, 1/4-Inch NPT Bottom Mount 2 Inch Gauge, 0-3000 PSI, U.L. Listed, Gold Steel Case 1/4 Inch NPT Bottom Mount Brass fitting that is corrosion resistant Oxygen cleaned welding gauge per (A.N.S.I. B40.1) Suitable for use with acetylene. Recommended for use with compressed gas regulators.