1. Go to the regular building materials market to buy as needed, so that the quality of the water pipes is more guaranteed. 2. Check the surface of the water pipe to see if its appearance is smooth and uniform. You can touch it with your hand to see if it feels fine; at the same time, it is necessary to see whether the anti-counterfeiting logo of the manufacturer is marked on the water pipe. If not, it is best not to buy it. 3. Look at the color of the water pipe. The high-quality stainless steel water pipes are generally silver-white, and the black ones are generally not subjected to acid-base passivation treatment, which is easy to scale. The color of high-quality PPR pipes is generally matte milky white, and there will be no variegated particles in them. If the color of the water pipe is mixed with some variegated colors, it means that the quality of the water pipe is not good. 4.The plastic pipe should smell the odor of the water pipe. If the water pipe has a pungent odor, it means that the quality of the water pipe is not good, and the high-quality water pipe will not have a pungent odor. 5. Pay attention to the connection method of metal pipes. Generally, simple self-locking circlip type connections are used for household use.