The cylinder is mainly used for the modification of trailers and semi-trailers. It has various connection methods, such as ball joints, hinges, earrings, and hinge shafts. The cylinder is a multi-stage sleeve type cylinder. 　　Sleeve diameter φ80~φ170 　　Travel around 1000mm 　　Rated pressure 16~20MPa 　　4TG-150*830QZ 　　level 4 　　Cylinder diameter 150,129,110,90 　　Travel 830mm 　　Ball head type