Jacuzzi Temperature Sensor for J-300 Series Hot Tubs made 2016 and later.
Part Number 6600-551
Fits J-315, J-325, J-335, J-345, J-355, J-365, J-375 and J-385
Also Fits 2018 + J-200 Series Hot Tubs
Plugs into circuit board with a 3 space plug (not shown) but only uses 2 wires