For use with the Kajak Sport round rubber 20cm hatch cover. Rim lip is: 8 1/4 inches outside diameter. 7 5/8 inches inside diameter. The rim can be applied to any kayak with a flat deck space of 9 1/4 inches in diameter. Imported from Finland.
Use this link to the Kajak Sport Instructions (hard copy not included) use rim as template.
Basic Use Video (Shows a Kajak Sport hatch cover on a P&H kayak).
See a Kajak Sport Hatch Install Video demonstrating the install of a similar hatch on a plastic kayak with a contour challenge.
Rim Replacement for Plastic Kayaks at Pinterest (Please note that the "donut" may be needed on some, maybe most, but not all kayaks).