For Man Ship low profile deck hatches only Available in precut length of 5.5, 6.5, and 8 ft. length Neoprene Gaskets Calculate required Length = Cutout Size: 2(Length) + 2(Width) = x / 12 = Required Length Example : 24" x 24" Cutout = 2(24) + 2(24) = 96"/12" = 8 ft required Neoprene Gaskets are sold in pre-cut lengths For Man Ship low profile deck hatches Available in 5.5, 6.5, and 8 ft. length