Fiberglass Adapter PlateVodaland's fiberglass adapter plate is designed to provide a simple connection between our manhole covers and separators. Separators come normally with a solid fiberglass lid, but that lid is not designed to withstand frequent pedestrian or vehicle traffic. For this reason, most customers prefer to use one of our plastic or cast iron manhole covers. To connect the manhole cover to the separator, this fiberglass plate is used as the adapter for