Insert molding and over molding can be used interchangeably in certain circumstances. Insert molding is generally used when an insert is placed into a cavity and plastic is molded around the parts where over molding is when a plastic part is molded over a part.
We commonly mold hubs and manifolds over shafts and other components used in medical devices. Most parts are tested 100% for leaks and cross communication with molding over dual lumen shafts and other multi level components.