Master Mechanical License Practice Test 2025 - Free Mechanical License Practice Questions and Exam Guide

Threaded fittings are commonly required for gas connections in a residential setting because they create a secure, leak-proof seal that can withstand high pressure. These fittings allow for easy assembly and disassembly of gas piping systems, facilitating maintenance and modifications without having to cut and rejoin pipes. Threaded connections are particularly suitable for gas lines because they can be tightly sealed using appropriate thread sealants, which helps to prevent dangerous leaks.

In contrast, compression fittings might not provide the same level of security and can be more susceptible to loosening under pressure or temperature changes. Brazed fittings are typically used for joining metal pipes, particularly in applications involving refrigerants or hot water, rather than standard residential gas connections. Soldered fittings are generally used for plumbing lines involving liquids, mainly in copper plumbing systems, but are not recommended for gas since the heat involved in soldering could compromise the integrity of the fitting in a gas context.

Overall, the durability and ease of maintenance make threaded fittings the preferred choice for gas connections in homes.