Which type of gas piping connection is typically used to join different types or sizes of piping?

The threaded connection is commonly used to join different types or sizes of piping due to its versatility and ease of installation. This method involves cutting threads into the ends of the pipe, allowing for a secure and adjustable joint. Threaded connections can accommodate variations in pipe materials and sizes, making them suitable for various applications in gas piping systems.

Additionally, these connections do not require specialized tools like welding equipment or heat sources, which can enhance safety during installation and maintenance. The ability to easily disassemble threaded connections further facilitates repairs and modifications within gas systems.