[Compatible Replacement] Designed to replace part number 2560-040 and Q12DS-C2, your flow switch is fully compatible with compatible with Sweetwater, compatible with Jacuzzi, and compatible with Sundance spas and hot tubs. [compatible with Sundance Spas ] 09/2020+ 680 Series / 03/2020+ 780 Series, 04/2017+ 780 Dover / 10/2016+ 980 Series: Kingston, Claremont / 2016+ 880 Series: Maxxus, Aspen, Optima, Cameo, Altamar, Marin, Capri / 2013-03/2017 780 Montclair / 2011+ Series: Constance, Victoria / 2008-03/2017 780 Series: Camden, Certa, Chelsee, Hamilton, Hamilton / Hartcompatible withd, Burlington / 2007-2012 680 Hartcompatible withd, Hawthorne Models / 2007 Hamilton, Chelsee, Certa, and Camden / 2005-2006, 780 Palermo, Bahia, Cayman. [compatible with Jacuzzi & Sweetwater Models] compatible with Jacuzzi 2015+ J-500 Series / 09/2015+ J-400 Series / 2016+ J-300 Convertible / 02/2020+ J-300 Models / 10/2020+ J-200/J-100 / 2002-2003 J-320, J-330, and J-340 / 2004+ J-335,J-345 / 2007+ J-355,J-365, J-375 / 2007+ J-230, J-270, and J-280 with Circulation Pump Option / 2002-2015 J-300 LED Series (With Curled Finger Connectors) / 2011+ JLX, JLXL; compatible with Sweetwater 2003-2004 compatible with Sweetwater Models: Palermo Bahia, Cayman All 2003-2004 compatible with Sweetwater Models [Technical Infromation] Replace Part Numbers: 2560-040, Q12DS-C2. 2560-040 Flow Switch comes molded with a 3/32 inch hole opening. Prior to February 2008 a 3/32inch hole had to be drilled compatible with it to be installed on all 2002-2008 2 and 3 pump models. [Built to Last] High impact surgical plastic housing, brass wire with insulationg rubber cable. Good conductivity, fast response, small hysteresis, high precision, corrosion and heat resistance, waterproof, wear resistant. 0.85 inch hose connections and 0.4 inch freeze line connection. Clear plastic compatible with easy viewing of any debris in switch. Directional arrow labels affixed compatible with ease of install. Displays error messages FLO FLO2 and also a flashing FLO message. Easy to use and save your charge. 【Warm Tips】 Cable has Curled Finger Connectors. Do not use on other models such as 800