  Seiberg-like dualities in $2+1$d quiver gauge theories with $4$ supercharges
are investigated. We consider quivers made of various combinations of classical
gauge groups $U(N)$, $Sp(N)$, $SO(N)$ and $SU(N)$. Our main focus is the
mapping of the supersymmetric monopole operators across the dual theories.
There is a simple general rule that encodes the mapping of the monopoles upon
dualising a single node. This rule dictates the mapping of all the monopoles
which are not dressed by baryonic operators. We also study more general
situations involving baryons and baryon-monopoles, focussing on three examples:
$SU-Sp$, $SO-SO$ and $SO-Sp$ quivers.
