The relationship of dual models with renormalizable theories of massive Yang-Mills field is studied by the zero slope limit. The field theoretics meaning of the twisting operator and the topology of dual models is clarified. These features result from the choice of a special nonhermitian gauge condition in the underlying field theory. The local gauge invariance of that theory is the exact reflexion of the first set of gauge identifites appearing in the dual theory. In the nonhermitian gauge, some renormalizable massive vector meson theories are both manifestly unitary and manifestly renormalizable, and this leads to a spectacular simplification of the Feynman rules. (Author)
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