Rated at 6A, this inexpensive SPDT pressure switch, manufactured by Len Gordon, is fully adjustable from 1 to 5 psi, and has a 1/8" MPT connection (like all the pressure switches in our catalogue).
It is rated for use at 240V, but can also be found on systems running at 24V.
The pressure switch is among the most important pieces of safety equipment found in your spa system. It constantly monitors water flowing through the heater and helps protect the integrity of critical components if ever a problem arises.
Len Gordon: LG800140-3
Dimension One: 01515-04