... five series of patent products. They are flexible rubber joints, reduced rubber joints, rubber elbows, fan coil joint, sewage check ... systems, use of units such as power plants, water plants, mills, water companies, engineering and high construction,Common type used to ... customer made could reach to -30--250Mediaair ,compressed air,water,sea water,oil,acid,alkali etc.Main Data: DNLengthL(mm)Outer ...