... , has 157 patents. Dia from DN400mm to DN4000mm Concrete pipe:Applicable scope: Water supply for city, industry and irrigation ... also use in factory, seawater cooling recycle pipe, sewage water main pipe and downcomer pipe.Pipe diameter range: DN600mm to DN4000mmWorking Pressure: 0 ... koint with single gasket or with double gaskets Prestressed Concrete Cylinder Pipe with Antisepsis(PCCP) (AWWAC301)