New Mexico Pipe Fitter Journeyman (JPF) Practice Exam

What are the color codes for type K, L, M, and DWV tube types?

1. Green, Blue, Red, Yellow

2. Red, Green, Yellow, Black

3. Blue, Yellow, Green, Red

4. Yellow, Red, Black, Green

The correct answer is: Green, Blue, Red, Yellow

The color codes for various types of copper tubing are an important part of pipe fitting and plumbing, as these colors help to easily identify the different types based on their applications and thickness. Type K copper tubing is marked with the color green. It is the thickest type and is typically used for underground applications and high-pressure situations. Type L is marked with blue, indicating it is of medium thickness and commonly used for general-purpose applications including water supply lines and heating applications. Type M tubing, which is thinner than Type L, is identified by the color red. It is often used for residential plumbing and for low-pressure applications. Finally, DWV (Drain, Waste, and Vent) tubing is designated by the color yellow. This type of tubing is specifically used for drain, waste, and vent systems in residential construction. Understanding these color codes is essential for a pipe fitter to ensure proper selection and installation of pipes according to their intended use and specifications.