What material is typically used for gas line plumbing?

Black iron pipe or flexible gas piping is commonly used for gas line plumbing because it is specifically designed to handle the pressures and corrosive properties associated with gas. Black iron pipe is durable, can withstand high pressures, and is resistant to the high temperatures encountered with gas systems. Additionally, flexible gas piping, often made of corrugated stainless steel or another flexible material, allows for easier installation, particularly in areas with many bends or obstacles.

The other materials mentioned are less suitable for gas line plumbing. PVC piping, for instance, is not meant for gas and can become brittle over time, leading to potential leaks. Copper tubing, while sometimes used in limited applications, is not the standard for gas lines due to cost and concerns about its compatibility with gas. Galvanized steel pipe is also not typically used because the zinc coating can strip away and introduce contaminants, compromising the gas flow and creating risks of leaks. Therefore, black iron pipe or flexible gas piping stands out as the appropriate choice for ensuring safety and reliability in gas line installations.