Which stripe color identifies DWV copper tube?

Which stripe color identifies DWV copper tube?

• A. Red
• B. Yellow
• C. Blue
• D. Green

Answer: (B)

Color coding on copper tube is used to show what the pipe carries. For copper piping, a yellow stripe on the tube identifies it as DWV—drain, waste, and vent—and not for potable water. This helps workers avoid cross-connecting non-potable waste lines with drinking-water lines. Red stripe would indicate hot potable water, blue stripe cold potable water, and green isn’t the standard marker for DWV in this context, so it wouldn’t be used to designate DWV. So the yellow stripe is the cue that this copper tube is DWV.

Color coding on copper tube is used to show what the pipe carries. For copper piping, a yellow stripe on the tube identifies it as DWV—drain, waste, and vent—and not for potable water. This helps workers avoid cross-connecting non-potable waste lines with drinking-water lines. Red stripe would indicate hot potable water, blue stripe cold potable water, and green isn’t the standard marker for DWV in this context, so it wouldn’t be used to designate DWV. So the yellow stripe is the cue that this copper tube is DWV.