Flow Restr, 150gpd Blk In Wht Gst Ftg Control Type NXT2 Valve Model 3900 Valve Model 1800 Is the RES7031-20K test light

Is the RES7031-20K test light compatible with all water softener models

Remove any existing filter media or resin from the tank according to manufacturer guidelines

Install the FL11205 replacement part

it is optimized for 13 to 16 inch diameter tanks

Translates motor rotation into stepped valve motion

Flow Restr, 150gpd Blk In Wht Gst Ftg Control Type NXT2 Valve Model 3900 Valve Model 1800 Is the RES7031-20K test lightThis Watts (TST Water) Flow Restrictor is rated at 150 GPD and comes as a black insert housed in a white John Guest style quick connect fitting, designed for residential reverse osmosis systems. The flow restrictor is a small but essential component that controls how much water flows to the drain from the RO membrane, setting the all important ratio between treated permeate water and reject (concentrate) water. How It Tunes Your RO System A reverse