Forms an efflux pump with AaeA. Could function as a metabolic relief valve, allowing to eliminate certain compounds when they accumulate to high levels in the cell. Substrates are p-hydroxybenzoic acid (pHBA), 6-hydroxy-2-naphthoic and 2-hydroxycinnamate. Positively coregulated with aaeA and aaeX by AaeR. Belongs to the aromatic acid exporter ArAE (TC 2.A.85) family.