Widely Applications This water flow sensor switch can be use for Water heaters, pumps, hot tub, boiler, water dispensers, coffee machines, hot card machines, steam equipment, water system, the campus card sales, selling self-help water systems, water treatment equipment, cooling systems, mechanical equipment, instrumentation, pharmaceutical equipment. SpecificationOperation voltage of this flow sensor is : 0-220V(AC or DC), Working current: 0-2A, max working pressure: 1.75 MPa. Flow range: 1-30L/min.Safe and ReliableThis flow sensor switch is made of brass, all materials are in line with ROHS testing standards. It's a safety device that shuts off the current to the device (heaters, pumps, etc.) when it senses no water flow.When connecting the load, please add a relay.Thread type: 3/4" BSP Male Thread The flow sensor `s male thread external diameter: 25.85mm.It is fit in NPT Thread if you connect them with teflon Easy to install Our flow sensor is waterproof, heat resistance, pressurresistance, cold resistance, small size, stable and reliable.