The Excel Professional Grade Sand Filter features a flange clamp design that allows 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. Clear Sight Glass for backwash inspection. Multi-Port Valve With Quick-Connect Barrel Unions. Manual Air Release. Control valve with easy-to-use lever-action handle lets you dial any of the valve/filter functions. Large pressure sand/water drain for rapid winterizing or servicing.