What are the color codes for K, L, M, and DWV tubes?

The correct choice highlights the standard color codes assigned to various types of tubing used in plumbing and pipefitting, specifically K, L, M, and DWV tubes. The color coding system serves as a visual guide to help identify the type of tube and its associated applications.

K copper tube is typically used for applications requiring high corrosion resistance and is coded green. L copper tube, which is often used for both residential and commercial plumbing, is identified by the blue color. M copper tube, which is lighter and intended for less demanding applications, is indicated by the red color. DWV (Drainage, Waste, and Vent) pipes are associated with the yellow color, representing their specific function in a plumbing system.

Understanding this color coding is crucial for professionals in the field of pipefitting, as it aids in selecting the appropriate materials for the job and ensures compliance with industry standards and regulations.