... less noise, more stable. The metric and the US system are available. BNT-185 control valveEasy to ... US system are available.Specifications:Model: BNT-1850T (Softener valve by timer) BNT-1851T (Filter valve by timer) BNT-1850F (Softener valve ... meter delay, timer meter mix) BNT-1851F (Softener valve by meter,timer, meter delay, timer meter mix)Regeneration ... Drain pipe: 1/2"1 BNT-185 series control valve