How to judge that a pipeline accessories manufacturer is unreliable

First, see if its production equipment is advanced, which is directly related to product quality.

Look at its qualification certificate, which can prove whether the factory is compliant.

Also understand the customer's evaluation and word of mouth. Everyone says that it is really good.

There is also an important after -sales service of the factory. If you have problems, you can solve it in time to reassure.

Finally, check the production process and management of the factory on the spot, and there is a bottom heart