316 Stainless Steel wetted parts.
. Pressure Gauge, 4" 304SS Case, 316SS Internals, 5000 psi/kg/cm2, 1/4 NPT Male Back Conn, Glycerin Filled For gauges with MIP, GY40 fill is standard for liquid filled gauges.Corrosion-resistant fillable dry or liquid-filled gauge. Cleaning for Oxygen Service O2 is available only for dry or HL Halocarbon filled gauges.