For waterproof casing, rigid waterproof casing factory, flexible waterproof casing factory waterproof casing is divided into flexible and rigid. According to the standard atlas can be divided into: national standard and non-standard. GB waterproof casing is in full accordance with the Ministry of Construction related 02S404 02S312 standard atlas selection and production, there are stringent requirements for flange thickness, thickness, diameter and thickness of the ring wing. According to the Atlas can be divided into: S312-type flexible waterproof casing and the 02S404 flexible waterproof casing. Two dimensions, structural form. According to the standard atlas can be divided into: national standard and non-standard. GB waterproof casing is in full accordance with the Ministry of Construction related 02S404 02S312 standard atlas selection and production is divided into flexible and rigid waterproof casing method. According to the standard atlas can be divided into: national standard and non-standard. GB waterproof casing is in full accordance with the Ministry of Construction related 02S404 02S312 standard atlas selection and production, there are stringent requirements on flange thickness, thickness, diameter and thickness of the ring wing