Beckson 4" Clear Center Screw Out Deck Plate - BlackScrew 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. Our clear center plates permit observation of controls or gauges and visual