Abstract: A method of using an injection mold assembly to fabricate a bulkhead fitting. The method includes using a core plate, aperture plate and a pair of slide blocks to form the mold assembly which contains the mold cavity. The aperture plate, which has an opening through the plate, is positioned within the assembly such that the fitting, which is molded within the mold cavity, does not contain a parting line across the sealing surface and o-ring groove of the fitting.