Qingdao only seven flex co., ltd is located in qingdao city, shandong province, founded in 2001, is a professional manufacturer both hydraulic hose and industrial hose, our products had passed the iso9001 and ce certificate quality system, which meet the international standard sae j517, din en853, en856 and en857.Only seven flex products are all widely used in coal ministry, petroleum exploitation, mechanical engineering and automatic high-pressure liquid transmission system.
