What is the purpose of a relief vent in plumbing systems?

The primary purpose of a relief vent in plumbing systems is to regulate pressure within the system. Relief vents are crucial for maintaining a balanced pressure by allowing air to enter or exit the system as water flows, which helps prevent conditions that could lead to vacuum or pressure build-up. This regulation of pressure ensures that waste and water can flow freely through pipes without causing issues like slow drainage or potential damage to the plumbing system.

While other options relate to plumbing functions, relief vents specifically target air pressure regulation. For instance, backflow prevention is typically accomplished through devices like check valves, and enhancing drainage mainly involves maintaining a proper slope and unobstructed pipes. Understanding the unique role of relief vents in pressure regulation is essential for effective plumbing system design and operation.