Copper tubing is manufactured and classified as type K, L, and M. Which type would offer the greatest wall thickness for a given nominal size?

Correct Answer: Option A — Type K

Copper tubing is classified by wall thickness: Type K is the thickest, followed by Type L, and Type M is the thinnest. Type K is typically specified for high-pressure applications or where severe service conditions exist, providing the greatest structural integrity and corrosion allowance for a given nominal size.