For gauges with MIP, GY40 fill is standard for liquid filled gauges. 316 Stainless Steel wetted parts.Vacuum and compound ranges through 0 psi to 20,000 psi. Pressure Gauge, 4" 304SS Case, 316SS Internals, 300 psi/kPa, 1/2 NPT Male Bottom Conn, -40 Degree Service Filled, Maximum Indicating Pointer Pressure Gauge, 2.