... in the production of AOJ series industrial plugs, sockets , couplers and so on .Certification : CE , CCC , ISO:9001, GBQuality ... with standard ISO9001:2000 International Quality Management System , and it has passed the certifications of GB/T11918,GB/T11919 ... unanimously by authoritative organization as well as old and new customers . Industrial plug and socket , waterproof plug , electric plug