The most common type of piping used in homes for natural gas is black wrought iron pipe. It's strong, durable, and can handle high pressures. Black pipe is also resistant to rust and corrosion, which makes it a good choice for indoor use.

The type of piping used in homes for natural gas is usually black iron pipe. It's strong and durable, and it can handle high pressures. Black iron pipe is also relatively easy to work with, so it's a good choice for do-it-yourselfers.