What color is Type K copper typically coded?

Type K copper is typically coded green. This color coding helps identify the thickness and type of insulation or piping used in plumbing and heating applications. The green coding is specifically designated for Type K copper because it is known for its thick wall and is often employed in applications where durability and resistance to corrosion are critical, such as underground or in harsh environments.

Red or pink coding generally refers to other types of copper tubing, such as Type L, which has a thinner wall. Blue and yellow, likewise, correspond to different specifications of copper piping, with blue often indicating Type M, which is used for lighter-duty applications. Understanding these color codes is essential for maintenance professionals to ensure they are selecting and using the appropriate materials for a given job.