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In a model of supersymmetric SU(5) Grand Unification with a spatial dimensiondescribed by the orbifold $S^1/(Z_2 \times Z_2')$, proton decay is naturallysuppressed at all orders. This is achieved by a suitable implementation of thediscrete symmetries on the brane. But baryon number violating interactions arepresent in this model. We propose a few possible experimental tests of thismodel which exploit the effect of the baryon number violating couplings onlow-energy observables like neutron-antineutron oscillations, double nucleondecay into two kaons, hadronic decay widths of the $Z$ boson, and $t \bar t$production cross-section in Run II of the Tevatron.Comment: Latex, 9 pages, no figures; typos corrected, published versio

Testing orbifold models of supersymmetric grand unification