Find a bricklayer with working experience in a local decoration company or labor market. Communicate with the master, design the plan of the direction and space division of the defecation pipe in the garage, and carry out the construction according to the drawing direction. Find the nearest sewage supervisor around the garage, report to the residential property, and dig and construct after approval and payment of the corresponding management fee. It is suggested that the pipe with the diameter of 10- 14 cm be used as the main sewage pipe. Carry out water pressure test after construction.