True or false: New or replacement shut-off valves for medical gas pressure piping systems shall be quarter-turn full ported ball tight valves.

The statement is true because in medical gas systems, shut-off valves play a crucial role in ensuring the safe and effective management of gas flow. Quarter-turn full ported ball valves are preferred for their reliability and ease of use. They provide a clear indication of whether the valve is open or closed, which enhances safety during operation. The full port design allows for minimal resistance to flow, which is important in medical applications where gas supply must be consistent and efficient. These types of valves can offer a tight seal, ensuring that there are no leaks in the system, which is paramount in maintaining patient safety and adherence to regulatory requirements. Thus, using quarter-turn full ported ball tight valves in new or replacement installations aligns with recommended practices in medical gas piping systems.