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 reinforced thermoplastic for dependable, all-weather performance * 7 position Hayward Vari-Flo control valve with easy-to-use lever-action handle lets you dial any of the valve/filter functions.