... Use safety AC 12V, less noise, more stable. The metric and the US system are available. BNT-185 control valveEasy ... to operate, high reliablility.Use safety AC 12V, less noise, more ... timer, 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