HydroQuip High Limit Sensor for 4100, 6100, 7100 series and EasyPak EP1500A, B, C series control systems. Wh3, Mspa, Tspa. Also listed as high limit probe 9920-400122.

Product notes: 14" cable. Bulb - 1/4"D x 1-1/2"L. 3-wire, 4-pin connector. This is part #34-0201 - Will not interchange with #34-0201D, which is a different hi-limit. 9920-400122