Hayward 21" Sand Filter W3S210T with SP0714T Valve Pro Series high-rate sand filters are the very latest in pool filter technology. Molded of durable, corrosion-proof polymeric material, they feature attractive, unitized tank construction for years of trouble-free operation with only minimal care. Pro Series sets a new standard for performance, value and dependability. Applications In-ground or Above Ground pools of all types and sizes In-ground spas (residential or commercial) Water features (fish ponds, fountains, water gardens) Features Flange clamp design allows 360 degree rotation of valve to simplify plumbing. Integral top diffuser ensures even distribution of water over the top of the sand media bed. Full-size internal piping provides smooth, free-flowing performance. Unitized, corrosion-proof filter tank molded of rugged, colorfast polymeric material for dependable, all-weather performance. SP0714T is a 7 position Hayward Vari-Flo™ control valve with easy-to-use lever-action handle lets you dial any of the valve/filter functions. Integral sight glass lets you see when backwash cycle is completed. Large pressure sand/water drain for rapid winterizing or servicing. Precision engineered umbrella-fold self cleaning laterals for balanced flow and backwashing, plus easy serviceability Weare a Authorized Hayward Dealer!