Channel protein that mediates glycerol entry under ethanol stimulation (PubMed:12832087). Does not seem to mediate glycerol uptake under standard conditions (PubMed:12832087). glycerol(in) = glycerol(out) Aquaporins contain two tandem repeats each containing three membrane-spanning domains and a pore-forming loop with the signature motif Asn-Pro-Ala (NPA). Decreases the gylcerol uptake in presence of ethanol. Belongs to the MIP/aquaporin (TC 1.A.8) family.