Predicted to enable UDP-galactose transmembrane transporter activity and UDP-glucose transmembrane transporter activity. Involved in endoplasmic reticulum organization and nematode larval development. Located in Golgi apparatus and endoplasmic reticulum. Expressed in coelomocyte; egg-laying apparatus; gonad; intestine; and pharyngeal cell. Is an ortholog of human SLC35B1 (solute carrier family 35 member B1).