The unification of gauge interactions in the context of adjoint $SU(5)$ and its phenomenological consequences are investigated. We show the allowed mass spectrum of the theory which is compatible with proton decay and discuss the possibility of having a cold dark matter candidate. Because of the upper bounds on the proton decay partial lifetimes, $\tau (p\to K^{+}\overline{\nu })\le 9.3\times {10}^{36}\mathrm{years}$ and $\tau (p\to {\pi }^{+}\overline{\nu })\le 3.0\times {10}^{35}\mathrm{years}$, the theory could be tested at future proton decay experiments. The theory predicts also light scalar color octets which could be produced at the Large Hadron Collider.

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