Carvin SERIE'S FEATURESFeatures a corrosion resistant and UV resistant precision molded one piece tank. The 26" (66cm)Spherical tank design for superior strength, longer life.Stainless steel clamp allows for 360 degree rotation of the dial valve for easy installation.2" plumbing for less flow restriction.Sturdy injection molded base for secure tank support.7-way dial valve controls Filtration, backwash, rinse, whirlpool, drain, winterize and test operations.UniFlo underd