  We revisit the Dirac quantization condition for string-like and string-less
(but multi-valued) magnetic monopole potentials. In doing so we allow for an
{\it a priori} different coupling ${\tilde e}$ associated with the longitudinal
components of the gauge potential. By imposing physical criteria in the choice
of the longitudinal--transverse decomposition we show that -in contrast to some
recent claims- the `unphysical' coupling $\tilde e$ does not appear in the
quantization condition.

High Energy Physics - Phenomenology