Fleck 5600 Timer Valve Filter Only Backwash head for filter only tanks Fleck 5600 Timer Valve Filter Only Backwash Control Head for filter tanks Not for water softeners! If you have a softener, see our other items Automatic backwashing, using 12 day timer to set what days you want Easy to use, 5 year warranty, Fleck the most reliable valve on the market You will need a bypass valve or yoke if you do not currently have one