ITEM NAME:5-18V 6mm Hose Barb End Water flow Sensor 75-570ml/min For Hot Water Heate Gw.Tightness: Seal up all the holes, and inflate with 0.8MPa water, after 1 minute, no leakage and deformation. Intubation design of inlet and outlet pipe, easy connection and operation. Flow range: 75ml-570ml/min.