Made by Gecko
Found somewhere (usually near the middle of the tub) so it is submersed in the water away from the heater. The clear flat plastic 4-pin (3 wires) plug plugs straight on to the PCB.
Cable Length: 297cm
This temperature sensor works on Gecko (MSPA), Spa builder and Hydroquip control systems.
it is easy to fit if your repairing your hot tub or spa because it simply plugs in on both ends.