Most water dispensers have pipes made of plastic or stainless steel that is safe for food. Both kinds of pipes can be used to carry drinking water safely, and they are often used to make water dispensers. High-density polyethylene (HDPE) or polyvinyl chloride (PVC) is used to make pipes that are safe to use with food. Because these pipes are light, bendy, and strong, they are perfect for use in water dispensers. They can also stand up to poisons and don't let bacteria grow because their surface is smooth. In water dispensers, pipes made of stainless steel are also often used. They are made of steel that doesn't rust, and they are strong, durable, and last a long time. Stainless steel pipes are easy to clean and keep, and they don't change the taste or quality of the water. Copper pipes may also be used in some water dispensers. But copper pipes can react with some minerals in the water, which can cause corrosion and make the water unsafe to drink. So, it's important to make sure that the copper pipes in water dispensers are treated and kept in good shape so that they don't hurt the water's quality.