Hayward Selecta-Flo multiport control valve is made of Hayward’s exclusive PermaGlass XL™ material and engineered for maximum flow. The Select-Flo control valve features an easy-to-use lever action handle that lets you "dial" up to four valve/filter functions: filter, backwash, waste or recirculate. Complete with an integral sight glass that lets you see when the backwashing cycle is completed.