Product Details + Watertight integrity is assured by bayonet closure and an O-ring seal.UV stabilised nylon.Heavy duty.Australian made quality.Other Details: Part No. Description Colour I.D. Ø(mm) O.D. Ø(mm) Cut OutØ (mm) MountScrews(mm) 36762 Kayak Inspection Port White 140 195 162 3 c/s 36764 Kayak Inspection Port Black 140 195 162 3 c/s 36770 Kayak Inspection Port White 200 260 220 4 c/s 36772 Kayak Inspection Port Black 200 260 220 4 c/s