Hatch, Square, Inside Frame 19-1/16 In.
Hatch Opening: 19-1/16" x 19-1/16"
Cutout: 20-3/16" x 20-3/16" with 1-11/16"corner radius
OD Deck Flange: 21-13/16" x 21-13/16"
OD Lid: 22-5/8" x 22-5/8" with 2-7/8" OD radius
Deck-to-Lid Height: 15/16"
You need at least 7 feet of gasket for the entire hatch.
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