Bieroog 6 Inch Hole threaded lid Diameter Deck Plate Kit, Deck Hatch with Cat Bag for Kayak Boat Fishing Rigging (Contain Red Pocket and 2 pcs Kayak D Rings) The red bag is removable from hatch. Made of special plastic, very durable. Foam gasket protect hull from damage Personal advice6-inch hatch and non-waterproof cat bag requires 8-inch of flat space to be installed Outside Diameter: 8" Inside Diameter: 6" Products are highly: 1.77"the bag about 9 inch foot deep and Hatch bag is not waterproof.Please confirm the size before ordering.