... RO Solenoid Valve 2-way normally closed Voltage:110/220V,50/60Hz,12/24V Pipe size:3/8" ~ 2" With CE TUV certificates RO Solenoid Valve1 ... . 2/2-way normally closed, 3/8", 3/4", 1", 1¼",1½",2" pipe size; ... for orifice:Φ32, 40, 50 only);8.Brass series solenoid valve with CE TUV, ISO9001 approvement. Normally Closed|Open 2 Way Brass Electric Solenoid Valve