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Polylok Manway & D-Box Risers

These risers can be cast into concrete or used with the Polylok Distribution Box.  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.

These risers can be cast into concrete or used with the Polylok Distribution Box.  They feature structural ribs on the inside so frost cannot adhere to them in frost-prone areas....
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These risers can be cast into concrete or used with the Polylok Distribution Box.  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.