... the medium in pipes. FSF20W- 3/4 Magnetic flow switch is control switch that directly get signals from the flow of medium ... -condition, petroleum and petrifaction, etc.FSF20W- 3/4 Magnetic flow switch has lots of advantage, such as simple usage, small bulk ... temperature: 110 Max. fluid pressure: 2.5 MPaMax. working voltage: AC 220VMax. working current: 1AAvailable medium: R134a, R22, R407C, R404A/R507 ...