There are several kinds of plastic pipes used in residential pipes, but PVC has become the industry standard for drainage pipes and ventilation pipes. It's popular because it's easy to cut and much cheaper than other options. In old houses, the main drain and exhaust pipes are usually made of cast iron, which is an expensive and extremely difficult material to use. For this reason, Clear Polycarbonate Tube are almost always used to upgrade the old water pipe drainage system.
Clear Polycarbonate Tube is the abbreviation of polyvinyl chloride (PVC), which is a synthetic plastic with excellent stability and stress resistance. In addition, for drain pipes, it is also approved for cold water supply pipes, so it is often used in outdoor irrigation systems. But it can't stand high temperature, so it's not used in indoor water supply system.