What is referred to as waste piping from two or more fixtures on one trap?

The term that describes waste piping from two or more fixtures connected to a single trap is commonly known as "Continuous Waste." This concept is critical in plumbing because it effectively manages the drainage of multiple fixtures, such as sinks or lavatories, allowing them to share a trap. This method helps to conserve space and can simplify installation and maintenance, while still adhering to plumbing codes and ensuring proper drainage.

In plumbing systems, continuous waste systems are designed to balance the flow and maintain proper air venting, preventing issues such as siphoning or backflow between fixtures. Understanding this configuration is essential for any plumbing professional, as it demonstrates knowledge of proper drainage methods and their applications in multiple fixture installations.