  We study the non-abelian $SU(2)_D$ extension of the $U(1)_D$ Stueckelberg
portal, which plays a role of the mediator between the Standard Model (SM) and
Dark Sector (DS). This portal is specified by the Stueckelberg mechanism for
generation of dark gauge boson masses. Proposed $U(1)_D\times SU(2)_D$
Stueckelberg portal has a connection with SM matter fields in analogy with
Familon Model. We derive bounds on the couplings of dark portal bosons and SM
particles, which govern diagonal and non-diagonal flavor transitions of quarks
and leptons.
