The Uniweld G2S is a welding gauge suitable for use with acetylene. The gauge is housed in a 2 inch gold painted steel case with a 1/4 inch NPT bottom mount connection. Gauge has a twist on polycarbonate lens and a pressure range of 0-30 (Red Line 15-30) PSI. Recommended Part No. GB20S 2 inch Protective Rubber Gauge Boot for additional protection for your gauge. Gauge is recommended for use with compressed gas regulators.