Jiashan DI-PRO Auto Parts Co., Ltd. is a professional manufacturer of spring brakes, replacement parts, air valves, gladhands, hubcaps and slack adjusters. Wholly owned by DI-PRO Inc., we have the necessary equipment and technical expertise directly sent by DI-PRO to assure you of highest quality. The factory is staffed with well-trained workers that are consistently producing good quality spring brakes at very competitive prices.