316 Stainless Steel wetted parts.
Pressure Gauge, 4" 304SS Case, 316SS Internals, 60 psi, 1/4 NPT Male Back Conn, Glycerin Filled, 304SS Bezel & U-Clamp Corrosion-resistant fillable dry or liquid-filled gauge.For gauges with MIP, GY40 fill is standard for liquid filled gauges. Cleaning for Oxygen Service O2 is available only for dry or HL Halocarbon filled gauges.