Square D brand adjustable pressure switch. This super reliable, high quality switch suits a pressure range of 25-80PSI (170kpa -550kpa). Can run up to a 2.2kw single phase motor at 240V and can be used for both water pumps and air compressors. Pipe connection is 1/4 inch (8mm) internal (female). CLICK HERE for pressure switch spec sheet If you want to find out more about pressure switches check out our blogs Pressure switches, the unsung hero of a pump system   and  Water pump pressure switch vs. pressure controller