Nominal Tube Size (inches) O.D. I.D. Wall Thickness
Type
K L M DWV K L M DWV

1/4

 0.375 0.305 0.315 - - 0.035 0.03 - -
3/8 0.5 0.402 0.43 0.45 - 0.049 0.035 0.025 -
1/2 0.625 0.527 0.545 0.569 - 0.049 0.04 0.028 -
5/8 0.75 0.652 0.666 - - 0.049 0.042 - -
3/4 0.875 0.745 0.785 0.811 - 0.065 0.045 0.032 -
1 1.125 0.995 1.025 1.055 - 0.065 0.05 0.035 -
1-1/4 1.375 1.245 1.265 1.291 1.295 0.065 0.055 0.042 0.04
1-1/2 1.625 1.481 1.505 1.527 1.541 0.072 0.06 0.049 0.042
2 2.125 1.959 1.985 2.009 2.041 0.083 0.07 0.058 0.042
2-1/2 2.625 2.435 2.465 2.495 - 0.095 0.08 0.065 -
3 3.125 2.907 2.945 2.981 3.03 0.109 0.09 0.072 0.045
3-1/2 3.625 3.385 3.425 3.459 - 0.12 0.1 0.083 -
4 4.125 3.857 3.897 3.935 4.009 0.134 0.114 0.095 0.058
5 5.125 4.805 4.875 4.907 4.981 0.16 0.125 0.109 0.072
6 6.125 5.741 5.845 5.881 5.959 0.192 0.14 0.122 0.083
8 8.125 7.583 7.725 7.785 - 0.271 0.2 0.17 -
K, thick walled, underground residential, commercial and industrial uses.
L, medium walled, residential and commercial uses
M, thin walled, above ground residential and light commercial uses.
DWV, Drain/Waste/Vent, non-pressurized