The 3M Disk Marker provides an easy and accurate method of precisely locating flush mounted facilities, which become covered by backfill. The four inch disk marker is easily fastened to the underside of non metallic lids or covers over flush mounted facilities, such as hand holes, manholes and other grade level enclosures during construction and maintenance. Disk Markers are not intended for direct burial.

• Locates flush-mounted facilities which have become covered by backfill
• Offers easy marking of buried lines
• Passive antenna encased in orange water-resistant polyethylene shell
• Withstands a temperature range of -4 to 122 °F (-20 to 50 °C)
• Works without any external power source