Hayward Vari-Flo XL multiport control backwash valve is made of Hayward’s exclusive PermaGlass XL material and engineered for maximum flow. The Hayward Vari-Flo Valve SP710XR50 features an easy-to-use lever action handle that lets you "dial" up to six valve/filter functions: filter, backwash, waste, rinse, closed or recirculate. This Hayward backwash valve is complete with an integral sight glass that lets you see when the backwashing cycle is completed. SP710XA-50 is stamped into body to the left of the Return port.