Clearly mark valve locations, manholes, service lines, storm drains, cable routes and test stations using William Frick’s durable curb markers. Frick curb markers can be permanently installed on most flat surfaces such as curbs (face or top), road surfaces, and more. Each rigid-plastic curb marker is coated with a UV-stable urethane dome for maximum survivability in harsh environments. The Frick curb marker's optically clear, self-healing and non-yellowing dome protects against mechanical and chemical abrasion. These items are also known as storm-drain markers, utility markers and distance markers.