Configurable Port Assembly.

A configurable port assembly is used proximate a medium containing structure, such as a water tunnel, e.g. to measure fluid flow or inject flowing fluid into the tunnel. The configurable port assembly includes at least two configurable port assembly components assembled to define a configurable port extending from a first opening to a second opening. One or more of the configurable port assembly components can be rotated from a first to a second assembled position to define a configurable port having at least two predefined shapes. The configurable port assembly preferably includes four configurable port assembly components assembled and coupled together with coupling members, such as dowel pins, extending through the components. Two of the configurable port assembly components have shaped surfaces that define a shaped thickness of the configurable port while the other two components have shaped surfaces that define a shaped width of the port. Various shapes can be machined in the configurable port assembly components to provide numerous variations of the configurable port.