Cleaning for Oxygen Service O2 is available only for dry or HL Halocarbon filled gauges. Vacuum and compound ranges through 0 psi to 20,000 psi. Pressure Gauge, 4" 304SS Case, 316SS Internals, 5000 psi/kPa, 1/2 NPT Male Back Conn, Glycerin Filled, 304SS Front Flange Corrosion-resistant fillable dry or liquid-filled gauge..