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, use for air, water ... ", 1", 1-1/4", 1-1/2", 2".* 2W(UD) series solenoid valve, use for air, water, oil, gas. * Body material: Brass(stainless ... . * Port size: 1/8", 1/4", 3/8". 2 Port Solenoid Valve (2W Series)