Polylok Manway & D-Box Risers

These risers can be cast into concrete or used with the Polylok Distribution Box. They come with your choice of a flat cover, galvanized steel grate, plastic grate or with an inspection port. They feature structural ribs on the inside so frost cannot adhere to them in frost-prone areas. Additionally, they ll hold their shape, are stackable, screw together and are watertight and airtight.