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We consider acoustic wave transmission in non axisymmetric waveguide whichconsists of cylindrical resonator and two semi-infinite cylindrical waveguideswhose axes are shifted relative to the resonator axis and each other byazimuthal angle $\Delta\phi$. We show that for rotation of one of attachedwaveguides the coupling matrix elements of the eigenmodes of resonatorclassified by the integer $m$ and propagating mode of the waveguide acquirephase factor $e^{im\Delta\phi}$. That crucially effect Fano resonances andcreates an analog of faucet opening and closing wave flux under rotation of thewaveguide. We show that under the rotation of the waveguide and variation ofthe length of resonator numerous bound states in the continuum occurcomplimenting by the Fano resonance collapse.

Tuning of bound states in the continuum by waveguide rotation