Sprinkler-Control Valve Indoor/Outdoor, Butterfly Valve, Grooved Ends,175 psi, UL/FM, Slow-Close with Position Indicator & Supervisory Tamper Switch Assembly, Sizes (2" - 2-1/2"). Materials: Body: Bronze ASTM 584 UNS C8440, Disc: Stainless Steel ASTM A276, Type 304.