Shandong Industry Imp&Exp Co.Ltd.The factory is specialize in various gas cylinder,valve and medical accessories.Advantage:Own material factory,control cost,quality and delivery timeGB,CE,ISO,SGS certificationCooperated with several internation projectsExported more than 14 yearsOEM/ODM Our main products GAS CYLINDER 3L-50L STAINLESS STEEL CYLINDER HIGH PRESSURE CYLINDER VALVES OXYGEN AND INDUSTRIAL GAS CYLINDER VALVES MEDICAL ACCESSORIES USED FOR MEDICAL Visit Us sdwzgm@gmail.com +86-15506355533 503 Huayuan road liaocheng city, china