316 Stainless Steel wetted parts.5" 304SS Case, 316SS Internals, 15000 psi/kPa, 1/4 NPT Male Back Conn, -40 Degree Service Filled 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..