What is the primary purpose of a plumbing vent?

The primary purpose of a plumbing vent is to allow gases to escape from the drainage system. Vent pipes are critical components in a plumbing system as they prevent the buildup of sewer gases, which can be harmful and create unpleasant odors. By providing an outlet for these gases to escape into the atmosphere, the vent helps to maintain proper air pressure within the drainage system. This allows wastewater to flow freely and reduces the risk of blockages caused by changes in pressure. Additionally, vents are essential for the proper functioning of fixtures, as they prevent the siphoning of water from traps, which could lead to clogging and backflow issues. Thus, the correct answer reflects the vital role that plumbing vents play in maintaining a safe and functional plumbing system.