Ensure the continuity of the pipeline, the angle should be as smooth as possible, and use special reducing joints or fittings. Requirements for reducing the diameter of pvc pipes are as follows:

1, to ensure the continuity of the pipeline, that is, the inner diameter and outer diameter of the pipeline should be continuous, and there should be no obvious protrusions or depressions.

2. The angle should be as smooth as possible to avoid sharp turns or excessive deformation, which can reduce pipeline resistance and improve flow.

3. Use special reducer joints or fittings, and avoid using joints or fittings made of other materials to ensure the tightness and stability of the pipeline.