Coloured aluminum product trench is an important part of the drowning system components, the appearance of bright colors, mainly aluminum alloy material, finished product trench can help gather water, and then eliminate buildings through rain pipes. The construction of rain pipes in the painted aluminum trench must be carried out after the completion of the process used, and must not be interspersed with other types of work so as not to affect the installation quality. And should pay attention to protect the material rain water pipe, finished product trench, strictly prohibit damage. The connection of the finished product trench, the sealing plate, and the connection between the groove connector and the trench must be sealed using the external building silicone gel. The standard for sealing is that the width of the gum is measured in the gap. Not less than 1 cm, the thickness of the adhesive is not less than 2 mm.