Digital Pressure Control Switch, Eletronic Pressure Controller For Air Pump ,Easy to Use - 2 POINTS EXTRA WIRE_1

Pressure transmitter inside, stable and accuracy. Switch of the pump during water shorta and on with water. MCU micro-computer process chip, safe and intellint control. One-k set up on/off limit. Installation:If the pump doesn't have a check valve, then a check valve must be installed in front of the pressure, in this case the pump may on/off ,or frequently.