1, according to the different properties of PVC pipes, it is divided into two specifications, one is soft PVC pipe and the other is hard PVC pipe. Mainly because there is no plasticizer in it, but the soft PVC pipe does. Therefore, relatively speaking, the physical properties are slightly weaker and the water pressure is lower.

2. There are many different sizes, for example, the maximum nominal diameter can reach 50 mm, and some diameters are 2.5 mm, 3 mm, 4 mm, 5 mm, 6 mm and so on. Common sizes are 16 mm, 20 mm, 25 mm, 30 mm, 40 mm and 50 mm, which can be used as threading pipes.

3. If used as a water pipe, the commonly used sizes are 20mm, 32mm, 50mm, 75mm, 90mm, 200mm, etc. Relatively speaking, the nominal diameter is slightly larger, but compared with the drainage pipe, it is not that big. However, it is necessary to choose water pipes with higher strength and better aging resistance in order to achieve a longer service life.