Manufacturer of Valve Stem Seals, AOK has ISO9001 qualification and supplies high quality valve stem seals. Established in 1995 and AOK has made concrete contribution to valve stem seals industries for over 10 years. AOK has excellence in Valve Stem Seals, Boned Seals (Washers), Bushing & Absorbers, and precision custom designed rubber molded products. AOK market globally and sold the valve stem seals in European, America and Asian country. In order to maintain high quality, the valve stem seals from AOK are all inspect thoroughly, therefore, AOK had won worldwide recognition and built a good reputation.