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We analyze $K\to \pi \nu\bar \nu$ rates in a model with a TeV-scaleleptoquark addressing $B$-meson anomalies, based on the flavor non-universal4321 gauge group featuring third-generation quark-lepton unification. We showthat, together with the tight bounds imposed by $\Delta F = 2$ amplitudes, thepresent measurement of $\mathcal{B}(K^+ \to \pi^+ \nu \bar\nu)$ alreadyprovides a non-trivial constraint on the model parameter space. In the minimalversion of the model, the deviations from the Standard Model in$\mathcal{B}(K^+ \to \pi^+ \nu \bar\nu)$ are predicted to be in closecorrelation with non-standard effects in the Lepton Flavor Universality ratios$R_D$ and $R_{D^*}$. With the help of future data, these correlations canprovide a decisive test of the model.

Flavor Non-universal Vector Leptoquark Imprints in $K\to \pi \nu\bar \nu$ and $\Delta F = 2$ Transitions