PVC-U water supply pipes are made from hard polyvinyl chloride (Unplasticized PVC) as raw material. They possess high strength, corrosion resistance, and anti-aging properties, and are widely used in urban and rural water supply and water transmission systems. The inner walls of these pipes are smooth, resulting in low water transmission resistance. They are easy to install and have a low cost, meeting the hygiene standards for drinking water. However, it should be noted that they have low-temperature brittleness (applicable temperature range: 0 – 40℃).