It is mainly manifested in four aspects:
1. Different standards: a tube adopts national standards to strengthen the management, while b tube is an enterprise standard, which is an international management.
2. The thickness of the pipe wall is different: the material of the a pipe is better than that of the B pipe, the strength is higher, and the wall thickness is also thicker, which is 3mm. Compared with the b tube, the price is higher and the wall thickness of the b tube is 2.8mm.
3. The b-pipe is for household use and is usually used for ventilation. While a pipe is less used in households, it is usually used for drainage.
4. The a-tube belongs to the cold-formed type, while the b-tube belongs to the non-cold-formed type.