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A four-inch screw-in deck plate for small spaces. Installs on a flat space 6.25 inches in diameter. Cover and deck cut-out are 4.5 inches in diameter. The rim will not support a bag! This 4 inch Beckson hatch can be used as a substitution for the Viking brand 4 inch cover. The deck cut out and screw pattern for both 4 inch Beckson and Viking rims is identical. The Beckson 4-inch has a single thread in the rim. The Beckson cover will not screw into a Viking rim. If you need to replace a 4 inch Viking you will have to remove the old rim and replace with this 4 inch Beckson cover and rim. See similar hatch install instructions for additional information: Installing A Six-inch Hatch.
See also: Kayak Hatch Replacement Options Part II - Deck Plates.