Efflux pump that mediates resistance to fosfomycin (PubMed:27650185). Probably also involved in the secretion of biofilm matrix that contributes to the pathogenicity (PubMed:27650185). Inhibited by the efflux inhibitor and energy decoupler carbonyl cyanide m-chlorophenylhydrazone (CCCP). Expression is up-regulated on exposure to fosfomycin. Disruption of the gene increases susceptibility to fosfomycin. Disruption also results in impaired biofilm formation and decreased virulence. Belongs to the major facilitator superfamily.