This Pro-Line marker post (vendor part WF-17SPNLWHI, Millennium Part #636614) is a white flat-panel utility marker post designed to identify buried fiber optic cable and other underground utility lines along a route. Its panel-style design offers a broad, easy-to-read surface for route information, warning text, or company branding, helping locate crews and excavators spot line paths from a distance. Built from weather-resistant materials for reliable outdoor performance, this marker post is stocked in Millennium's Marker Posts & Signs category, supporting fiber, gas, and utility infrastructure projects nationwide.