Which material is commonly used for vent pipes in plumbing systems?

The use of PVC (polyvinyl chloride) for vent pipes in plumbing systems is common due to its properties that make it advantageous for this specific application. PVC is lightweight, resistant to corrosion, and easy to handle and install. Its smooth interior surface helps in reducing friction for the gases venting out, and it does not rust or react with the substances typically found in plumbing systems, which contributes to its longevity and reliability.

In addition, PVC is also cost-effective compared to other materials, making it a popular choice among plumbing professionals for both new installations and repairs. Its wide acceptance in plumbing codes further solidifies its status as a preferred material for vent piping.

While materials like brass, galvanized steel, and copper have their uses in specific areas of plumbing, such as water supply lines or drainage systems, they are not typically employed for vent pipes due to factors like higher cost, susceptibility to corrosion (in the case of galvanized steel), or difficulty in installation and maintenance (especially with copper). This context highlights why PVC stands out as the go-to material for vent pipes in plumbing systems.