We supply all kinds of PVC Sealing Ring 1)size:50,75,110,200mm 2)Certificate:ISO9001,8060 ... certificate;CE3)Size:50,75,110,200mmstandard:Germany Din8077/8078Pvc Sealing ring for sewage&drainage,qualified for GB,available in different sizePVC ... Sealing ring for sewage & drainage,qualified for GB,available in different sizeAvailable ...