The Chicago Plumbing Code

Table § 18-29-705.16

Caulking Ferrule Specifications

Pipe Sizes
(inches)

Inside Diameter (inches)

Length (inches)

Minimum Weight Each

2

2 1/4

4 1/2

1 pound

3

3 1/4

4 1/2

1 pound
12 ounces

4

4 1/4

4 1/2

2 pounds
6 ounces

For SI: 1 inch = 25.4 mm, 1 ounce = 28.35g, 1 pound = 0.454 kg