The towline introduced (1) the towline shape like a tank chain, consisting of a large number of unit link, the link to rotate freely. 

 (2) the towline of the same series within and outside the same pitch, inside width towline, the bending radius R may have a different choice. 

 (3) unit chain around the chain plate and the upper and lower lid, to towline each section can open, easy assembly and disassembly, do not have threading, open the cover to the cable, tubing, trachea, plumbing in drag chain. 

 (4) Also available separate pieces, separated by chain space as needed. The towline Model: (1) steel and aluminum towline can be divided into 
 TL type, TGA, type the TGB type. 

 (2) plastic towline can be divided into heavy, light, model, set outside the high number of the towline. 
 The towline selection: within: Select the most coarse of a built-in cable, tubing, trachea, plumbing, etc. as the reference height, plus at least 10% of the height of space as a towline. If the overlap according to overlap the actual height as the reference height. 

 Inside Width: Choose coarse cables, tubing, trachea, water pipe, its diameter, and the towline within wide reference and left at least 10% of the width of the space. 

 Bending radius: built-in cable, tubing, trachea, plumbing, and the largest bending radius as a reference value, and left more than 10 percent of the space. 

 Towline built-in cable, tubing, trachea, plumbing placement guidelines 

 15% of the remaining space should be left, so that the built-in cable, tubing and other free activities do not generate tension in the radius direction of the towline. 

 The diameter difference should be separated from the large wire laying, weight evenly distributed, when necessary, can be used separate piece separate. 

 High-speed or high-frequency operation, the wires are separated from each other in the level, do not overlay each other in the cable, trachea, tubing, and other more time to recommend the use of the separated piece.