For installing a roof drain flush with the top surface of an uninsulated roof deck. These are often made of materials such as plywood or poured decks. Portals Plus Bearing Pan is made of heavy, 18 gauge spun steel for easy topside installation, and allows structural poured decks to proceed ahead of the plumber (only a standard core hole is required). Accepts all Portals Plus Roof Drains and all roof decks.