Control Board Only, IQ2020; only compatible with North American HotSpring hot tubs. For all IQ 2020 Control Boxes 73223 found on all 2001-2009.5 Hot Spring, Tiger River and Limelight spa models. This IQ 20 20 circuitboard (motherboard) does not include the secondary heater relay board or plastic encasement. This is the main circuit board only. The control thermistor and hi-limit thermistor connect directly onto this control board at the top edge. If your current (2001-2002) IQ 2020 control box has thermistor ports on the right side exterior of the control box, then you will need different thermistors. You will need one 39530 and one 39525 in addition to this board.