... ball valve DN20, 12VDC, 2 way, brass, with manual switch. Application:1.HVAC 2.Water treatment 3.Chemical ... , convenience for all kinds of requirements.2).Float ball design, no leak, most suitable for heavy dirt ... and long time no action.3).The conditions that solenoid valve ... power off, the valve remain fully open position. 2.Connecting SW and CLOSE, the valve close, getting ...