Polyvinyl chloride (PVC) and chlorinated polyvinyl chloride (CPVC) are common thermoplastic piping materials used in both residential and industrial applications. These materials exhibit good corrosion resistance and are lightweight, easy to handle and install, and require low maintenance. Often, PVC and CPVC piping are used in plumbing, water supply, and wastewater treatment. There are numerous standards and specifications available for PVC/CPVC pressure piping systems. When working with these materials, it is important to reference these standards, which can be found within many manufacturers’ technical manuals.