Probably involved in the diffusion of protonated ethanolamine (EA) into the cell at low pH. At low pH most EA is protonated, and this permease becomes necessary. Amine and polyamine degradation; ethanolamine degradation. Belongs to the EutH family. In strain MG1655 the eut operon is interrupted by the CPZ-55 prophage, encoding 9 genes situated between eutA and eutB, which are translated in the other direction. CPZ-55 may prevent expression of the eut operon in strain MG1655. Strain W3110 does not have this prophage element and should be able to express the operon.