BELOW ARE THE NOMINAL WALL THICKNESSES OF THE PVC TUBING

SIZE

WALL THICKNESS

3/16

.019 I.D

¼

.019 I.D

5/16

.019 I.D

3/8

.021 I.D

7/16

.025 I.D

½

.025 I.D

5/8

.027 I.D