Beckson Marine 8" Smooth Center Screw-Out Deck Plate - White. These Boating & Marine by Beckson Marine use a self-aligning center and an innovative gasket to assure a watertight seal and a back-up sealing wall that will keep this plate watertight even if the gasket is removed. The Beckson Marine 8in Smooth Center Screw-Out Deck Plate comes in a variety of materials that are incredibly useful and will create a great addition to your toolbox. A screw-out plate should be used in compartments that see a change in air pressure due to temperature or oil canning can occur. Install the Beckson Marine 8in Smooth Center Screw-Out Deck Plate on your boat today for a maintenance-free way to access your shut-off valves or back-fastenings inspection and clean out for tanks and compartments that have a change in air pressure due to temperature or oil canning can occur. Package Contents: Beckson Marine 8" Smooth Center Screw-Out Deck Plate Beckson Marine DP80-W: 8" Smooth Center Screw-Out Deck Plate - White