Hydrolyzes both 3- and 4-linked fucoses in Lewis determinants. Not active on neither 2-linked fucose nor on fucose in alpha-1,3-linkage to the innermost GlcNAc. an alpha-L-fucoside + H2O = an alcohol + L-fucose Optimum pH is 5. Activity decreases sharply toward pH 7. Belongs to the glycosyl hydrolase 29 family. Was reported by PubMed:11788770 to be an alpha-1,2-fucosidase.