The 6500-310 is the Smart Heater used in Sundance Spas from 2000 to current. The Smart Heater is a complete replacement heater which includes the high-limit thermo disc and the necessary wires for connecting to the control board.
The MARGARITA RING inner tube is perfect for lounging and features a cup holder as well as a lime shaped backrest to keep you comfortable and relaxed all season long.