Copper tubing color coded green corresponds to which Type?

Copper tubing color coded green corresponds to which Type?

• A. K
• B. L
• C. M
• D. N

Answer: (A)

Green copper tubing identifies Type K. In plumbing practice, tube types are color-coded so you can tell at a glance how thick the wall is and what pressure rating you’re dealing with. Type K has the thickest wall of the common residential types, which makes it suitable for underground service and other installations where extra protection is needed. That’s why you’ll often see green tubing used in those scenarios. By comparison, blue-coded tubing is Type L and red-coded tubing is Type M, which correspond to medium and thinner walls for interior and lighter-duty work. This color coding helps installers choose the right tube for the job and spot mismatches quickly.

Green copper tubing identifies Type K. In plumbing practice, tube types are color-coded so you can tell at a glance how thick the wall is and what pressure rating you’re dealing with. Type K has the thickest wall of the common residential types, which makes it suitable for underground service and other installations where extra protection is needed. That’s why you’ll often see green tubing used in those scenarios. By comparison, blue-coded tubing is Type L and red-coded tubing is Type M, which correspond to medium and thinner walls for interior and lighter-duty work. This color coding helps installers choose the right tube for the job and spot mismatches quickly.