Square D Pumptrol 20-40 PSI Pressure Switch is designed to control electrically driven water pumps with precision and reliability. Compatible with a variety of water pumps including jet pumps, submersible pumps, and reciprocating pumps, this pressure switch uses a diaphragm actuation mechanism and features two poles to effectively manage the pump motor's operation. Operating within a pressure range of 20 to 40 PSI, it ensures consistent regulation of water pressure in your system. The switch includes a 1/4" - 18 NPSF internal thread, making it easy to connect with standard plumbing fittings commonly used in water pump systems. I for residential, commercial, and industrial applications, this pressure switch plays a vital role in maintaining optimal water pressure and promoting efficient pump performance. Model Number: FSG2J20CP