This temperature sensor fits most Hot Spring spas manufactured since 2002. It screws into a fitting in the Watkins No-Fault heater, and it may also fit other models. Remember to buy the o-ring separately, if needed.
Watkins recommends that you change the Hi-Limit sensor at the same time because they have approximately the same life span.
Cable length: 97 cm
Probe diameter: 6 mm (15 mm at the thread)
Plug : 4-pin connector, which fits on pins mounted on the hot tub motherboard
Hot Spring : Grandee, Vanguard, Jetsetter, Prodigy and Sovereign since 2001, Vista between 2004 and 2013, Envoy since 2004, Accolade between 2005 and 2006, Aria since 2007, Grandee NXT, Envoy NXT and Jetsetter NXT since 2014
Tiger River : Siberian between 2001 and 2004, Sumatran and Bengal between 2001 and 2010, Bengal Model MM between 2005 and 2010.
Hot Spring/Watkins: 39205 or 39530