Enables alpha-1,3-galactosyltransferase activity. Acts upstream of or within glycosphingolipid biosynthetic process. Predicted to be located in membrane. Predicted to be integral component of membrane. Predicted to be active in Golgi apparatus and vesicle. Orthologous to human A3GALT2 (alpha 1,3-galactosyltransferase 2). [provided by Alliance of Genome Resources, Apr 2022]