Replacement rubber hatch cover for Wilderness Systems kayaks such as the Tarpon and Ripper. May fit other makes and models of kayaks by Perception, Mad River and even Liquid Logic. Same fit as the Six Inch Star hatch, the Liquid Logic Logo Hatch or the plain top generic 5.5 in. Hatch Cover.
Important Article: Kayak Hatch Replacement Options - Part I - Rubber Covers. WSH
The W Hatch Cover is 6 1/16 inches O.D. - 5 3/4 inches I.D, and has a tie-off point for an internal leash. Often used with a Cat Bag.