Flow Switch Tee Clear 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 Series compatible with 03/+ 780 Series compatible with 04/2017+ 780 Dover compatible with 10/2016+ 980 Series: Kingston, Claremont compatible with 2016+ 880 Series: Maxxus, Aspen, Optima, Cameo, Altamar, Marin, Capri compatible with 2013-03/2017 780 Montclair compatible with 2011+ Select Series: Constance, Victoria compatible 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 Pump compatible with 2007 Hamilton, Chelsee, Certa, and Camden compatible with 2005-2006, 780 Palermo, Bahia, and Cayman Compatible with Jacuzzi Hot Tub Models: compatible with 2015+ J-500 Series compatible with 09/2015+ J-400 Series compatible with 2016+ J-300 Convertible Models compatible with 02/+ J-300 Models compatible with 10/+ J-200/J-100 Models compatible with 2002-2003 J-320, J-330, and J-340 Models compatible with 2004+ J-335,J-345 compatible with 2007+ J-355,J-365, J-375 Models compatible with 2007+ J-230, J-270, and J-280 Models with the Circulation Pump Option compatible with 2002-2015 J-300 LED Series (With Curled Finger Connectors) compatible with 2011+ JLX, JLXL models Compatible with Sweetwater Spas Models: compatible with 2003-2004 Sweetwater Models: Palermo Bahia, Cayman All 2003-2004 Sweetwater Models