Board For: A) 2007+ 780 1-Pump Metro and Solo B) 2005+, 2006+ 780/850E 1-pump. Lagunas, Caprio, Metro, Solo and Cayman C) 2004 Portofino Series 2-Speed Caprio, Metro and Solo D) 2002-2003 Caprio, Caprio ST, Tango and Solo E) 2003-2004 Sweetwater 2-Speed (Lagunas) F) 06/00-2001 Portofino 1-Speed/2-Speed Board (Caprio, Caprio ST, Tango, and Solo). Was 6600-085 G)01/00-05/00 Caprio, Tango and Solo (was 6600-084) Replaces older #6600-084, 6600-085, and 6600-086 Board Sundance obsolete board, will send 6600-286 board in its place. This board is for circulation pump systems. Comes with a Series 3.56 chip.If your circuit board has a Software Chip that begins with a 3, then this is the correct series board. Sundance has revised this chip several times, we send you the board with the current chip of 3.56. If you have an older board without a Circulation pump, then you need a board with a Series Chip that starts with a 5. Factory Direct PCBoards, they are NEW and not rebuilt. They come with warranty from Sundance. PCBoards are returnable only for warranty exchange or repair.