Heavy duty design to meet a range of demands from commercial swimming pools to industrial process piping. Class 150 full-face flange design. Valve body supports flanges when installed. 3", 4", & 6" feature PVC Body and Disc, EPDM liner, stainless steel stem, top index plate and hardware, and a coated steel lever handle. They also feature a full boot design, requiring no flange gaskets. 8' features PVC Body and Disc, an EPDM single side seal design, which is field replaceable (flange gaskets are required for 8"), and a molded PP lever handle. All feature 10-position indexed handles, and are rated to 150 psi non-shock water at 73°F, and are also suitable for vacuum service.