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6600-728, Sundance, Jacuzzi Spas Circuit Board. this is the latest revision board that takes the place of the following boards: 6600-180 (see notes on this board below!), 6600-098 and 6600-161 Circuit Boards. Please note it is VERY IMPORTANT that you verify what you have especially if you had the 6600-180 board that was used on many models that this board is not compatable to.The boards come with the same mounting footprint as older circuit boards to simplify replacement. Click here for Installation Instructions (pdf)Used on these Sundance Spas: