Polybutylene is a type of plastic commonly used in plumbing systems and piping. It is known for its flexibility, resistance to scale and chlorine, and low thermal conductivity. This material was widely used in residential and commercial construction from the 1970s to the mid-1990s. However, polybutylene has faced criticism due to its tendency to degrade over time, leading to leaks and water damage. As a result, many homeowners have opted to replace their polybutylene pipes with more durable materials like PVC or PEX. This shift has been driven by concerns over the long-term reliability of polybutylene plumbing systems.