Abstract: Apparatus and method for installing a thermometer-receiving well within a fluid service pipe without interrupting the service in the pipe. A rod member is provided which defines a first end for removably receiving a cutting member for cutting through the fluid service pipe. The cutting member is then removed from the rod member and a connecting member is removably attached to the first end of the rod member in place of the cutting member. The connecting member is adapted to removably receive a thermometer well whereby the rod member can be used to cut through the fluid service pipe and to install the thermometer-receiving well within the fluid service pipe without interrupting the service in the pipe.