Dock seal is used for simple seal between trucks and overside port .In order to ensure work quickly and safely. According to the size of the carriage, it can be adjusted flexibly to suitable for various occasions, so it can meet needs of a wide range of customers. The high quality of top and side panels which are mounted on steel frame of retractable .This product is designed to be flexible and durable. The curtain plate and the frame are ind- ependent parts. Components can be easily assembled with bolts. It has the advantages of simple structure, lost cost, reliable work, convenient replacement and maintenance for wearing parts, etc.