To locate underground pipes or conduit, use sonde with Jameson’s Buddy® Rodders and Fish Tapes or Duct Hunter™ Traceable Rodders. The heavy duty flexible chain adapter guides the rod through bends in pipe and helps prevent breaking end of rod when inserting into pipe. Fits 3/8″ & 1/2″ Buddy® Rodders, 5/16″ & 7/16″ Duct Hunter™ Traceable Rodders, Jameson’s 14-169 Sonde and any sonde with 1/4″-20 hole.