What is a loop vent primarily used for?

The loop vent is primarily used to serve two or more floor outlet fixtures that are battery wasted. In plumbing systems, particularly in situations involving multiple fixtures that drain into a common waste line, a loop vent allows for the effective venting of the drainage system. This configuration helps to maintain proper air pressure within the drainage system, preventing the loss of trap seals while ensuring that wastewater can flow efficiently.

By providing a means for airflow and pressure equalization, the loop vent helps to reduce the likelihood of siphoning that can occur with fixtures that are closely spaced, thus ensuring that all interconnected fixtures can operate without causing each other's trap seals to break. This makes it particularly useful in multi-fixture arrangements, promoting effective waste removal and proper system functioning.