This is a detailed model of a heavy duty circular flap gate typically used for hydraulic facilities. Easily placed in any industrial setting. Could work as a manhole or porthole on a submarine, oil tanker, or even a spacecraft. Materials, textures, and lighting setup is included. Accurate ribbing design on ring seating for placement in a real world situation. Lid is IK linked to the main body for easily adjusting and animating the lid. Full max construction stack based on spline and poly model is available for alterations, polycount adjustment, or retexturing.