... )series* 2W(UW) series solenoid valve, larger port type, use for air, water, oil, gas. * Body material: Brass(stainless steel option). Seal material ... /2", 2".* 2W(UD) series solenoid valve, use for air, water, oil, gas. * Body material: Brass(stainless steel option). Seal material: NBR ... size: 1/8", 1/4", 3/8". 2 Port Solenoid Valve (2W Series)