2 port solenoid valve: 2W(UW), 2W(UD)series 2 port solenoid valve: 2W(UW), 2W(UD)series* 2W(UW) series solenoid valve, larger port type ... ", 3/4", 1", 1-1/4", 1-1/2", 2".* 2W(UD) series solenoid valve, use for air, water, oil, gas ... : 1/8", 1/4", 3/8". 2 Port Solenoid Valve (2W Series)