  We engineer a brane picture for the reduction of Seiberg dualities from 4D to
3D, valid also in the presence of orientifold planes. We obtain effective 3D
dualities on the circle by T-duality, geometrizing the non-perturbative
superpotential which is an affine Toda potential. When reducing to pure 3D, we
define a double-scaling limit which creates a confining sector, giving a
unified mechanism for the brane reduction of dualities.
