Square D 1/4 in. Pumptrol Pressure Switch features a low water cut-off switch designed to shut off the pump at 12 P.S.I., effectively preventing overheating damage to submersible well pumps. This pressure switch is highly for use with submersible pumps and is also compatible with jet pumps and reciprocating pumps. It operates with standard action contacts that open on rising pressure, and it is diaphragm actuated with 1/4" 18 NSF internal threads, ensuring reliable and efficient performance. Available in pressure ratings of 20 - 40 psi and 30 - 50 psi, this switch is i for electrically driven water pumps, providing precise pressure control and protection. Model Number: FSG2J20M4CP