6600-166, Short Housing Temperature Sensor with Curled Finger Connectors. Used On: 1)2006+ 780, 680 Series 2)2005 780,850E Series,Portofino, and Sweetwater. 3)2003-2005 Del Sol Systems. 4)1998+ Solo, 701,724 Systems. 5)Replaces 6600-070. These sensors are interchangeable with the 6600-167 except for the end connector which could be wire nutted on. The Temp Sensors are located in the filter compartment on the side. They are unscrewed from the inside of the tub and the wire is fed through the tub into the equipment compartment. Follow the wire to the PC Board. To feed the new sensor, we usually drain the tub below the hole and pull the old sensor out a couple of feet into the tub, cutting the old sensor head off, we tie on the new sensor (connector end) to the old wire and pull the wire through into the equipment compartment. The connectors on the Temp Sensor are attached to a pc board connector that is located on the PC Board (usually at the top). There are other wires connected to this plug: Jumper interlock wire,Flow Switch, High Limit and Temp sensor. Remove the pin connector from the board .