The outer membrane component of an organic solvent efflux pump. Involved in export of a number of organic solvents, including toluene and styrene. This is the most important solvent efflux pump in this strain, although it can export AMP and some antibiotics. Constitutively expressed; the ttgGHI operon is further induced about 4-fold by toluene and styrene but not by antibiotics. Belongs to the outer membrane factor (OMF) (TC 1.B.17) family.