Waterproof Deck Plate, White, 5-3/16" - Seasense
Price: $17.99
Part # 50031054
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Watertight access points without the use of tools. Great for access to shut off valves or back-fastenings, inspection ports and the ability to clean out compartments. UV stabilized plastic construction. Easy installation. Screw cap.

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description is misleading and plastic is cheap
by Jeffrey from Ashland, Wisconsin on September 11, 2016
I ordered 5-3/16 deck plates. What i got was 4" deck plates. No dimension on these covers is 5-3/16". The description is horrible, as you don't know what you're buying. Also, the plastic feels really cheap, as does the tether and gasket. the gasket falls out of place when you open the cover. I'm returning these.
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very good, but could use simple, slight improvements
by Jeff from Cape Carteret, North Carolina on October 16, 2014
pros: good quality, comes with a small plastic 'leash' that can be attached to the lid center with a wood screw and used to keep the lid from getting lost (this will also keep the gasket from getting lost if you use this leash), just attach one end to the center of the lid and the other to one of the 6 mounting fasteners. cons: The size of the opening is 4 inches, I think the description is a little unclear and likely gives overall dimensions, opening diameter should be listed. The gasket is clear and is very loose-fitting, it seals very well, but if you are not careful it could be easily lost when the cover is unscrewed (especially since it is clear and hard to see or feel when inserted properly).
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Are these screw in or bayonet lids?
This series has both snap and screw in styles. This particular one is a snap in style.

What are the cut-out diameters for the 6 13/16" and 8 1/8" deck plates?
According to Seasense's sources, the cutout is 5-1/8 inches.

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