Fleck 2510SXT metered water softener head replacement valve 2510 SXT New Fleck 2510 SXT Digital Water softener valve replacement Fully adjustable, 5-cycle control upflow backwash, delivers downflow brining slow rinse, rapid rinse, brine refill, and downflow service. Digital touch pad controls Time-tested, hydraulically-balanced piston, seal and spacer, controls Backwash capacity handles tanks up to 16" diameter for softener