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Product Description Uniweld G7S - 2 Inch Gauge, Pressure Range (PSI) 0 to 4000, U.L. Listed, Smallest Graduation 100 PSI, Accuracy (-Percent) +/-3-2-3 per A.N.S.I. B40.1 Grade B, Gold Steel Case, 1/4 Inch NPT Brass Bottom Mount Connection. Oxygen cleaned welding gauge per (A.N.S.I. B40.1) suitable for use with oxygen, nitrogen, fuel gases and medical equipment which are non-corrosive to brass or bronze. Recommended Part No. GB20S 2 Inch Protective Rubber Gauge Boot. Recommended for use with compressed gas regulators. From the Manufacturer Uniweld G7S – 2 Inch Gauge, Pressure Range (PSI) 0 to 4000, U.L. Listed, Smallest Graduation 100 PSI, Accuracy (%) +/-3-2-3 per A.N.S.I. B40.1 Grade B, Gold Steel Case, 1/4 Inch NPT Brass Bottom Mount Connection. Oxygen cleaned welding gauge per (A.N.S.I. B40.1) suitable for use with oxygen, nitrogen, fuel gases and medical equipment which are non-corrosive to brass or bronze. Recommended Part No. GB20S 2 Inch Protective Rubber Gauge Boot. Recommended for use with compressed gas regulators.