The Marker post is made out of. 125” thick heavy duty UV treated polyethylene. Standard length is 6' with a high visibility orange dome cover and black print. Marker posts are ideal for identifying buried electric cable, fiber optic routes and gas and water pipelines. While there are several product manufacturers, not all of these products are the same. There are many things to consider when choosing the right post markers for your company or. Accurately marking the position of buried utilities such as water mains, gas pipelines, fibre optic cables, and electric lines is essential for safety, compliance, and operational efficiency. Please contact Preformed Line Products for pricing and availability.