Beckson Marine 8" Clear Center Screw-Out Deck Plate - White. These Beckson Marine Boat Parts are designed with a patented single start non-jamming extra strong self-cleaning buttress thread. And they incorporate a self-aligning center and an innovative gasket to assure a watertight seal. Beckson Marine 8" Clear Screw-Out Deck Plates permit observation of controls or gauges and visual inspection without the necessity of removing the center. Beckson Marine 8" Clear Center Screw-Out Deck Plates are used for access to shut-off valves or back-fastenings inspection and clean out for tanks and compartments where a change in air pressure due to temperature or oil canning can occur. Package Contents: Beckson Marine 8" Clear Center Screw-Out Deck Plate Beckson Marine DP80-W-C: 8" Clear Center Screw-Out Deck Plate - White