What is the maximum number of fixtures that can be associated with a 2" trap?

The maximum number of fixtures that can be associated with a 2-inch trap is primarily determined by plumbing codes, which provide guidelines to ensure proper drainage and waste management. According to the Uniform Plumbing Code (UPC) and similar standards, a 2-inch trap is typically designed to accommodate a certain volume of waste and water flow.

In most cases, a 2-inch trap is rated to serve a maximum of one fixture. This is because a larger number of fixtures could overwhelm the trap, leading to potential drainage issues, blockages, or ineffective waste removal. Having only one fixture ensures that the flow through the trap meets the necessary hydraulic requirements without risk of backflow or other complications.

Therefore, understanding the limitations of plumbing fixtures and their corresponding traps is essential for ensuring compliance with residential plumbing codes and for maintaining effective plumbing systems.