6600-167, Sensor with Box End Connectors. Used on: 1)2005+ 880 Systems 2)1997-2005 850 Systems. 400,600,600-S,750, 800 and 850 Systems. 3)1992 Suncoast, 4/96-4/98 Suntub SV/DV Systems. 4)1997 850 Systems 5)Replaces #6600-138 and 6600-105(not shown). These sensors are interchangeable with the 6600-166 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 a tube 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 . To remove a sensor or switch wire from the sensor harness connector, insert a paper clip into the slot corresponding with the wire to be removed. This will depress the pin tine, allowing the wire to be pulled from the harness connector. Important! When reinstalling the sensor or switch wire back into the sensor harness connector, make sure the pin tine is lifted (approx. 1/32") prior to inserting the wire. This will insure the sensor wire locks into the harness connector. Do not over bend the pin tine or it may break off.