Beckson 6" Non-Skid Screw-Out Deck Plate - WhiteScrew Out Deck Plate The Beckson Screw Out Plate was designed to provide access without the use of tools, with a single start non jamming (no cross thread), extra strong, self cleaning buttress thread. They incorporate a self aligning center and an innovative gasket to assure a watertight seal. A back up sealing wall leaves the plate watertight, even if the gasket is removed. Deck plates are used for access to shut off valves or back fastenings,