... plastic, 2.used for air, water and oil. 3.Direct Acting,normally closed 4.Port size:1/4 2P series plastic solenoid valve ... is used for air ,water, oil, gas.It's easy to maintain ... VZ,MVSD Series Solenoid Valve4H, TSV Series Hand-pull Valve4H Series Hand-draw ValveHV,K3 Series Hand-switching Valve4F series Foot ValveJM,MSV Series Mechanical ValveST ...