Sugar phosphate/phosphate translocator that transports inorganic phosphate, triose phosphate, 3-phosphoglycerate, xylulose 5-phosphate (Xul-5-P) and to a lesser extent ribulose 5-phosphate. Does not transport ribose 5-phosphate or hexose phosphates. Provides cytosolic Xul-5-P to the chloroplast, where it is used as an intermediate in the plastidic pentose phosphate pathways. Widely expressed. Belongs to the TPT transporter family. TPT (TC 2.A.7.9) subfamily.