Durable, corrosion-proof filter tank molded of color-fast material for long-lasting, all-weather performance * 7-position Vari-Flo valve provides maximum flow at lower pressure drop * Large pressure sand/water drain for rapid winterizing or servicing * Flange clamp design allows 360-degree rotation for easy installation * Integral top diffuser ensures even distribution of water over the entire sand bed for maximum use of the filtration area