316 Stainless Steel wetted parts.
Pressure Gauge, 4" 304SS Case, 316SS Internals, 10000 psi/kPa, 1/4 NPT Male Back Conn, -40 Degree Service Filled, 304SS Front Flange, Maximum Indicati 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. Vacuum and compound ranges through 0 psi to 20,000 psi..