Flow Switch TeeClear plastic for viewing any debris in switch.With 0.85 inch hose connections and 0.4 inch freeze line connection.Directional arrow stickers affixed for install.Impact resistant plastic shell. Brass wire with fast conductivity, fast response, stable and reliable. Rubber cable with heatproof, wear proof, toughness and insulation.Install steps:Unscrew the old flow switch.To replace the flow switch use the supplied Teflon tape and replace the switch in the direction marked.Slide the wire through the hole and slide the plug back into place to complete the installation.Compatible with Sundance Spas Models:compatible with 09/+ 680 Seriescompatible with 03/+ 780 Seriescompatible with 04/2017+ 780 Dovercompatible with 10/2016+ 980 Series: Kingston, Claremontcompatible with 2016+ 880 Series: Maxxus, Aspen, Optima, Cameo, Altamar, Marin, Capricompatible with 2013-03/2017 780 Montclaircompatible with 2011+ Select Series: Constance, Victoriacompatible with 2008-03/2017 780 Series: Camden, Certa, Chelsee, Hamilton, Hamilton (circ pump), Hartford (circ pump), Burlington (circ pump)compatible with 2007-2012 680 Hartford, Hawthorne Models equipped with a Circ Pumpcompatible with 2007 Hamilton, Chelsee, Certa, and Camdencompatible with 2005-2006, 780 Palermo, Bahia, and CaymanCompatible with Jacuzzi Hot Tub Models:compatible with 2015+ J-500 Seriescompatible with 09/2015+ J-400 Seriescompatible with 2016+ J-300 Convertible Modelscompatible with 02/+ J-300 Modelscompatible with 10/+ J-200/J-100 Modelscompatible with 2002-2003 J-320, J-330, and J-340 Modelscompatible with 2004+ J-335,J-345compatible with 2007+ J-355,J-365, J-375 Modelscompatible with 2007+ J-230, J-270, and J-280 Models with the Circulation Pump Optioncompatible with 2002-2015 J-300 LED Series (With Curled Finger Connectors)compatible with 2011+ JLX, JLXL modelsCompatible with Sweetwater Spas Models:compatible with 2003-2004 Sweetwater Models: Palermo Bahia, CaymanAll 2003-2004 Sweetwater Models