The WS4M uses a Fleck 5600SXT valve (3/4" connections) with an integral microprocessor based control. The programmable control utilizes high efficiency regeneration to minimize salt consumption. The beige colored resin tank manufactured by Structural is poly lined and fiberglass reinforced. The standard softener is a "two tank" configuration with a separate poly brine tank in almond. This softener includes a turbulator type distributor at no extra charge! A system by-pass valve is included along with the purchase of any unit. Fleck 5600SXT control