Sundance Spas Flow Switch with transparent tee 3/4" barb and a 3/8" barb off the side. This flow switch fits all 1999-present 2 pump or 3 pump systems and 2001+ 1-Pump Capri Systems. Used on the following Spa Models: Sundance 800/850/880 Series, 1999 - Present Sweetwater and Portifino Series with Circulation Pump J-300 LCD Series Models, 2002+ (with box end connectors). If you have a 2002+ LED J-300 use the 2560-040 (curled finger connector) Troubleshooting: A defective flow switch will cause a flashing 'Flo' or solid 'Flo' on the control panel icon. Solid 'Flo' is the flow switch Flashing 'Flo' could be the flow switch, circulation pump (clogged or defective) or dirty filter.