Morris Products 69008 Underground Tape, Printed With Caution Buried Electric Line Below, Red, 3" Width, 300ft Length Underground Tape - This High-Vis Underground Tape is perfect for identifying underground wires. High-Vis 4 Mil Non Adhesive Polyethylene underground tape Continuous repeat of warning Indentifies buried utility lines Should be installed 12 to 18 below ground level and 12 above pipes and conduits before backfilling