Mediates the efflux of short-chain diamines when energized by an electrochemical gradient (By similarity). Involved in resistance to the synthetic biocide chlorhexidine, a widely used antiseptic and disinfectant in both hospital and community settings (PubMed:24277845). Interacts directly with chlorhexidine and mediates its efflux via an energy-dependent mechanism (By similarity). Induced by chlorhexidine. Deletion mutant shows increased chlorhexidine susceptibility. Belongs to the proteobacterial antimicrobial compound efflux (PACE) (TC 2.A.117) family. Truncated N-terminus.