Caution Sewer pipe below underground warning tape. Black on red. Protection goes underground. Identify underground service pipes with this brightly coloured high quality linear low density polyethylene sheeting. If laid between pipes and top surface it will give a clear warning to plant operators using mechanical excavators as well as users of hand tools. The tape is printed with a \'caution\' warning and the name of the service. Heavy Guage Polyethylene. Resistant to alkalis and acids. Brightly coloured.