Rising Stem Gate Valve, Heavy Duty Service, 300 lb, Threaded Ends, Solid Wedge Disc, Union Bonnet, Gland Packed, Conforms to MSS SP-80. Type 2, Available Sizes (1/4" - 2"). Materials: Body, Stem, Bonnet & Wedge Disc: Bronze ASTM B 61, Seat Ring: Cu-Ni 90-10