Used on softeners up to 13-inch diameterTwelve day timer based regeneration-this is not a metered control valve.Fits standard 2.5-inch – 8 NPSM tank threadsContinuous flow - 20 GPMPeak flow - 26 GPMMax backwash flow - 7 GPMBypass/yoke SOLD SEPARATELYReplacement control valve for standard water softeners up to 13-inch diameter (2.5 cubic foot or 80k max capacity). Fits standard 2.5-inch -8 NPSM resin tank opening and offers a 12-day timer for initiating regeneration. Brine connection is standard 3/8-inch fitting common on most brine tanks (air check in the brine tank is required).If replacing an existing Fleck 5600 series control valve the existing bypass/yoke connection will connect directly to the new control head. If replacing a different head style a separate bypass/yoke connection will need to be purchased.