Fleck 5600 Mechanical Residential Control Valve Features Simple mechanical design is easy to use Two valve body designs: one for downflow regeneration and one for upflow (covers every valve in the 5600 family - quick access to all internal components) Injector/drain modules containing the brine valve, flow controls, and injector are removable from the valve's exterior Ruggedly-built timer is designed with heavy-duty 3/8" wide plastic gears 5600 controls are user-friendly and easily programmable Non-corrosive, UV-resistant, fiber-reinforced polymer valve body Choice of 7 or 12 day clock or demand regeneration with a mechanical meter Economical - small annual power consumption; keeps the time and activates the piston/valve mechanics with a single motor Designed with double backwash Options Bypass valve (Fiber-reinforced polymer or stainless steel) Backwash filter Upflow regeneration Low water use piston (uses as little as 29 gal./regeneration) Meter-initiated regeneration