What material should piping for LP gas systems be made of?

Piping for LP gas systems can be constructed from various materials, which is why the correct option indicates that any of the listed materials can be used. Steel is robust and resistant to damage, making it a common choice for underground installations and high-pressure systems. Copper is often utilized for indoor piping due to its durability and resistance to corrosion. Plastic, specifically certain types like polyethylene, is also acceptable for underground installations as it is lightweight and resistant to environmental factors.

The versatility in material choice allows plumbers to select the most appropriate piping based on the specific requirements of the installation, safety regulations, and environmental conditions. This flexibility is crucial for ensuring the efficiency and safety of LP gas distribution systems. Each of the materials has advantages and is code-compliant when installed correctly, highlighting the importance of proper training and adherence to regulations in the plumbing industry.