  The production of the $W$ and $Z$ bosons in single diffractive processes at
the LHC is investigated taking into account the ATLAS, CMS and LHCb acceptances
and considering different assumptions for the flavour content of the Pomeron.
The total cross sections and pseudorapidity distributions are estimated for
$pp$ collisions at $\sqrt{s} = 13$ TeV. Our results indicate that a future
experimental analysis of the ratio between the $W$ and $Z$ cross sections can
be used to probe the flavour content of the Pomeron.
