The Locating Sonde and Adapter Kit works with a duct rodder to trace underground pipes and conduit. The kit includes an adapter (#9-169) and a sonde (#14-170). The flexible adapter is used to attach the sonde to the end of the rod. The sonde emits a radio signal so you can determine the position and depth of the tip of the duct rod with a hand-held receiver as it snakes through the line. Applications include locating deep industrial and municipal storm and sanitary sewer lines.