For use with the Kajak Sport round rubber 10cm hatch cover. Rim lip is 4 3/8 inches outside diameter. Can be installed on a flat area of the deck 5 3/16 inches in diameter. Inside diameter is 4 inches. Imported.
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).