Best used as a replacement hatch cover for a six inch Sea-Lect Designs QUARTER TURN deck plate by Sea Dog Line. This deck plate comes with a rim and can be used for new installation or rim replacement. Rim has slots, not threads, and closes with a quarter turn. See an example of a quarter turn rim in the photo (alt part number K336165).
New Install: Use silicone sealant between hatch rim and deck surface when installing the deck plate rim-flange. Hatch cover 6 inches in diameter. Rim is 8 1/8 in. O.D. Deck cut-out is 6 ½ inches. On-center screw spacing, noon to six o’clock is 7 3/8 inches. For best results use no. 8 screws and nuts.
The rim of this hatch will support a six inch hanging bag.
See the Four Inch Hatch Install Video to gain insight into how might install this Six Inch Hatch. See more info: Kayak Hatch Replacement Options Part II - Deck Plates.