316 Stainless Steel wetted parts.
Vacuum and compound ranges through 0 psi to 20,000 psi.Corrosion-resistant fillable dry or liquid-filled gauge. Pressure Gauge, 4" 304SS Solid Front Case, 316SS Internals, 30000 psi, 9/16-18 UNF Bottom Conn, Glycerin Filled For gauges with MIP, GY40 fill is standard for liquid filled gauges.