Which type of copper tubing is generally considered to be the strongest and most durable?

Type K copper tubing is recognized as the strongest and most durable of the various types available. This designation is attributed to its thicker walls, which provide enhanced resistance to pressure and external damage compared to other types. Type K tubing is frequently used in applications that require a high degree of reliability, such as underground plumbing or industrial settings where durability is paramount.

The thicker walls of Type K make it less prone to deformation or failure under extreme conditions, making it ideal for long-term use in environments where the tubing might be subjected to not just water flow but also physical stresses. Its ability to withstand higher pressure ensures it can be used for a variety of demanding plumbing tasks.

Type M, typically used for lighter applications such as residential systems, has thinner walls and is not as strong as Type K. Type L is a commonly used option that offers a middle ground—it has thicker walls than Type M but still doesn’t reach the strength of Type K. Type DWV, which is designed for drainage, waste, and venting systems, is not intended for high-pressure applications, focusing instead on flow and venting efficiency without the same durability requirements. Hence, Type K stands out as the best choice for strength and durability in copper tubing.