Generally, the horizontal main drainage pipe and the first floor outlet pipe should be A-type pipe, and the drainage riser and branch pipe should be W-shaped pipe. The advantage of this collocation is that the mechanical performance of the flange gland connection of A-type pipe is better, and the service life and service function can be guaranteed when making the horizontal drainage main pipe. At the same time, due to its good mechanical strength, it is especially suitable for the horizontal drainage pipe of high-rise buildings, which can bear the impact of the upper water. Due to its fast installation and good flexibility of joint, W-shaped pipe should be used as the selection material of drainage riser. Especially when it is used as the installation of horizontal branch pipe in toilet room, the good flexibility and tightness of its interface can be used to control the slope of drainage pipe. At the same time, due to the characteristics of W-shaped pipe connector, combined with the current situation of completed decoration of Residential Engineering (generally, the exposed drainage riser in toilet and bath room), it is convenient for decoration and layout when concealed decoration of riser is carried out, which can save space and increase the actual use area. In addition, the use of A-type and W-type pipes in combination, in addition to the above reasons, but also because the residual short materials produced during the installation and construction of A-type pipes can be used as the installation and use of ground drainage horizontal branch pipes, saving materials and having good economic benefits. The connection of W-type pipe is carried out with stainless steel pipe hoop. The stainless steel throat hoop is composed of rubber sleeve, hose hoop, perforated rolling shaft and bolt.

In the actual installation project, the above two kinds of pipes have good effect, which can not only meet the needs of construction quality and use function, but also save materials and reduce costs.