The beta-matrix compositor was a component of Cardassian plasma distribution manifolds, which could not be replicated. In 2373, the plasma distribution manifold of Deep Space 9 needed to be repaired, but the beta-matrix compositor could not be replaced by Starfleet. Thus, Chief Miles O'Brien led a salvage team to DS9's abandoned sister station Empok Nor. (DS9: "Empok Nor")