Shanghai Trasun Mechanical Seals and metal bellow Manufacture Co., Ltd. is the largest Chinese professional designer & manufacturer of mechanical seal for pump, auto compressors and can replace the similar products of John Crane and Burgmann. Since 1998, we consistently demonstrated our passion for its reputation as a reliable and stable manufacturer of superior quality products and passed ISO9001, ISO14001 & ISO/TS16949, becoming the appointed OEM suppliers of famous domestic and overseas enterprises, 80% products are exported to outside and receive respected honor. In order to supply better and quick communication & service plat..