Part of the elfADCG-ycbUVF fimbrial operon, which promotes adhesion of bacteria to different abiotic surfaces. Could be involved in the export and assembly of the ElfA fimbrial subunits across the outer membrane. Expression is negatively regulated by H-NS and subjected to cAMP receptor protein (CRP)-mediated catabolite repression. The operon is cryptic under classical laboratory conditions, but is functional when constitutively expressed. Belongs to the fimbrial export usher family.