Vacuum Gauge, 6 in. 304SS Case, 316SS Internals, 30 vac/kg/cm2, 1/2 NPT Male Bottom Conn, Glycerin Filled. Corrosion-resistant fillable dry or liquid-filled gauge. Vacuum and compound ranges through 0 psi to 20,000 psi. 316 Stainless Steel wetted parts. Cleaning for Oxygen Service O2 is available only for dry or HL Halocarbon filled gauges. For gauges with MIP, GY40 fill is standard for liquid filled gauges.