Hayward's Vari-Flo XL multiport control valves made of reinforced thermoplastic material and engineered for maximum flow are the professional?s choice in multiport valves. All Vari-Flo control valves feature an easy-to-use lever action handle that lets you ?dial? up to seven valve/filter functions: filter backwash waste rinse closed winter or recirculate. Complete with an integral sight glass that lets you see when the backwashing cycle is completed our wide selection of valve configurations allows you to match the right Vari-Flo valve to the proper application; residential commercial top-mount or side mount.