  Kinematic misalignment between gas and stellar components observed in a
certain fraction of galaxies. It believed to be caused by acquisition of gas
from the external reservoir by major or minor mergers, accretion from
cosmological filaments or circumgalactic medium, etc. We aim to constrain
possible sources of the gas that forms counter-rotating component. We derived
the gas-phase oxygen abundance in 69 galaxies with kinematic misalignment
between gas and stellar components from MaNGA DR17 survey and compared it with
the metallicity expected according to the mass-metallicity relation. We found
that the oxygen abundance of the counter-rotating gas in our sample is higher
than 8.2 dex that excludes significant role of inflow of pristine gas.
Meanwhile, there is a significant difference in the oxygen abundance of the
counter-rotating gas between red and blue galaxies. In general, the oxygen
abundance is lower than expected for their stellar mass in red galaxies, but is
compatible with or even higher than typical values for their stellar mass in
blue galaxies. We showed that the exchange of enriched gas between galaxies is
the most plausible mechanism for explaining the metallicity of counter-rotating
gas components in galaxies of all masses and colors. Meanwhile, minor mergers
may play a significant role in the formation of counter-rotating gas components
in red and quenched galaxies.
