a novel design of a polymer retention hub created having an innovative feature used to permanently attach a thin wall nozzle core without use of adhesives or ancillary parts to form a conjunct nozzle . additional polymer in the correct amount is molded into a polymer retention hub in close proximity to a location where a mechanical lock must be formed to join the two components together . the inventive design of the polymer retention hub is configured to produce an enclosed cavity with the strength required for separation of a nozzle core from a standard taper .