PEX tubes come in a wide range of sizes, covering a wide range of diameters. Common specifications include dn10, 25, 32, 40, 50, 63, 75, 90, 110, 125, 140, 160, 180, 200, 225, 250, etc., and the diameter range can range from 32mm to 315mm. In addition, some specific PEX water pipe specifications include 16mm, 20mm, 25mm and 32mm, etc. These sizes of water pipes are usually used for specific applications, such as 16mm and 20mm water pipes are mostly used for hot water supply pipes, and 25mm and 32mm water pipes are mostly used for heating supply pipes.

In summary, choosing the right PEX pipe specification requires a comprehensive consideration of flow requirements, pressure requirements, installation environment and cost. In the actual project, it is recommended to calculate and evaluate on a case-by-case basis to determine the most appropriate pipeline specifications. At the same time, you can also consult a professional plumbing engineer or supplier for more specific advice and guidance.