What must be confirmed about gas piping before it is concealed in walls or floors?

Before gas piping is concealed in walls or floors, it is essential that it is tested and found to be leak-free. This requirement ensures safety by confirming that there are no leaks in the piping system, which can lead to dangerous gas accumulation and increased risk of fire or explosion. Testing for leaks is a critical step in the installation and maintenance of gas systems, as it helps to ensure the integrity of the gas delivery system and protects the occupants of the building from potential hazards. A leak-free system confirms that all joints, fittings, and connections are secure prior to being hidden from view, which would make future inspections and maintenance more challenging.