Nominal Diameter

Outside Diameter (cm)

Inside Diameter (cm)

Flow area (cm²)

½

2.134

1.580

1.961

¾

2.667

2.093

3.441

1

3.340

2.664

5.574

1¼

4.216

3.504

9.643

1½

4.826

4.090

13.13