The 40mm Cold Sensor Well (Pool Sensor Well)
Injection molded Coupling has an internal well which houses the Pool Sensor that's connected to the Solar Control.
The Cold Sensor Well should be glued to Class 9 & Class 12 PVC Pressure Pipe with plumbers pipe glue/adhesive.
The rebated well is then filled with thermal paste to provide accurate temperature readings.
The Thermal paste is sealed in with tape. Simply perforate the tape to insert the sensor.