PVC four has equal diameter and reducing diameter, equal diameter four nozzle end are the same size; The size of the main pipe of the reduced four is the same, and the size of the branch pipe is smaller than the size of the main pipe. The four way is a pipe fitting for the branch of the pipe.

Advantages of PVC drain pipes：
1. The pipe is light and easy to construct.
The specific gravity of PVC drainage pipes is about 1.4t/m3, which is only l/5 of cast iron pipes. Plastic pipes of the same length are much lighter than cast iron pipes. They only need to be transported manually during installation, and PVC drainage pipes are made of bearings. At the same time, the plug-in melt-adhesive interface has a standard length (6m and 4m) longer than that of cast iron pipes, which reduces the number of interfaces and the installation process.
2. Good drainage performance
The diameter of PVC drainage pipes can be smaller than that of cast iron pipes, or the same pipe diameter can use a smaller slope within the scope of the specification. This can increase the clear height of the space, which is more beneficial to users and enhances the quality of the building. Use function.
3: Economical and beautiful
The outer wall of PVC drainage pipes is usually white, and it is not used for anti-corrosion treatment such as painting with red lead or silver powder. There are no problems such as rust and peeling off of the outer wall of cast iron pipes. When installed concealed in the tube well, it does not require regular maintenance and care, while exposed installation is better than cast iron. The advantages of the tube are more significant: easy to clean, less obstruction to the visual effect, greatly improving people's living and working environment, and also facilitating the property management of the building.
4. Good social benefits
PVC drainage pipes can replace other steel drainage pipes on a large scale and greatly reduce energy consumption in the steelmaking process.
5. Superior physical and chemical properties
PVC drainage pipes have stable chemical properties and unique mechanical and physical properties that enable them to be used normally for up to 50 years. At the same time, their corrosion resistance, anti-aging, and wear resistance also make them more stable for long-term use than drainage cast iron pipes and cement pipes.