Heater Flow Switch 26-455-1002 with transparent body is compatible with Sundance Spas from 1999 2 and 3 pump systems and Sundance single pump Capri spas from 2001 and forward. Also fits 2002-2003 Jacuzzi J-350 J-360 J-370 and J-380 Models and Jacuzzi 2004-2006 J-355 J-365 J-375 and J-385 Models. Connects to 3/4 Hose with two 3/4 ribbed hose barb fittings and one 3/8 barb fitting. This resistive flow switch includes two wire leads to connect to spa control. A single pole normally open (SPNO) reed switch uses magnetic coupling carries 2. 5 amps and measures 0. 15 Ohms contact resistance. If your topside control panel is giving you a FLO error but your circulation pump is running and spa filter is clean you may have a defective Flo Switch. Spa heater flow switch 26-455-1002 Replaces 6560-858 and has 3/4 hose barb fittings. To install push into the hoses and clamp into place with the flow indicator arrow aligned with the water flow. Water is designed to hit the magnetic paddle head-on and must be facing in the correct direction to accurately measure water flow. Sundance Capri Jacuzzi are trademarks owned by their respective owners. There is no affiliation with the owner of the marks; the marks are used for identification purposes only and are not intended to indicate affiliation with or approval by the owner of the mark.