Automatic water softener. Electronic AUTOTROL valve 255 Easy-IQ (Reg. Metered-time). Valve body made of Noryl plastic material, NSF listed. Programming is simple and fast, just enter the time, day of week, time of regeneration, typically 02.00 at night, number of days between regenerations and hardness input. Complete with plug adapter 12/230V - 50Hz European plug. Hardness regulator output. Clutching the set screw is going to open the clapper by-pass, which allow you to mix raw water with water treated by