Forney 87730 Acetylene Gauge, Low Pressure, 2-Inch-by-1/4-Inch NPT, 0-30 PSI Low pressure gauge for acetylene regulators A 0-30 PSI falls under OISHA regulations 2-Inch face with 1/4-Inch national pipe thread NPT Features threads that are common to Forney, Victor, Harris, Smith and Marquette style regulators Solid brass threads and brass casings provide extra long life