G1/2 type sensor, its maximum pressure is 1.75mpa, the range of is from 1l/min to 30l/min. three wire connection: red for positive pole, for negative pole, yellow for pulse There is an integrated hall effect sensor that outputs an electrical pulse with every. the hall effect sensor is from the pipe and allows the sensor to stay and dry Made of copper material, environmental friendly, really sturdy and to use Lightweight, reasonable size,, low pressure start, easy to install, to use Can be perfectly used for heaters, dispenser, purifier, vending machine, coffee maker, measurement device, control machine and so