316 Stainless Steel wetted parts.
For gauges with MIP, GY40 fill is standard for liquid filled gauges. Pressure Gauge, 4" 304SS Solid Front Case, 316SS Internals, 30000 psi, 9/16-18 UNF Bottom Conn, Glycerin Filled Corrosion-resistant fillable dry or liquid-filled gauge.. Cleaning for Oxygen Service O2 is available only for dry or HL Halocarbon filled gauges.