This Pro-Line marker post (vendor part 625-400-10, Millennium Part #527535) is a utility marker post used to flag the route of buried fiber optic cable, gas lines, or other underground infrastructure. Installed along a utility corridor, marker posts like this give field crews, surveyors, and excavation contractors a visible, above-ground reference for buried line location, supporting damage-prevention compliance programs. Constructed from weather- and impact-resistant material for long outdoor service life, this post is part of Millennium's Marker Posts & Signs category serving fiber, gas, and utility contractors nationwide.