Beckson 5" White Screw In Deck Plate. The Beckson 5" Deck Plate is designed to conceal its mounting fasteners under the quick twist cover. The low profile cover is self-centering, and quickly locks in place with a 1/8 twist. Three separate sealing areas, each designed to chase water away from the plate opening, assure a watertight closure. The bayonet threads are non-jamming, self-cleaning and lift the center for easy removal.