An insert for use with a closed loop system, a dispensing system, a gravity draining system or other systems. The insert is designed to be inserted into the throat of a container such as a bottle. The insert includes a cylindrical seal which has a hardness which is less than the other components of the insert. The seal compensates for varying inside diameters of the throat of the container. The seal may be overmolded into a cylindrical recess formed in the insert or may be separately molded and then positioned in the cylindrical recess.