Joints between copper pipe or tubing and cast-iron hub pipe shall be made with a copper or copper-alloy ferrule or compression joint. The copper pipe or tubing shall be soldered to the ferrule in an approved manner, and the ferrule shall be joined to the cast-iron hub by a caulked joint or a mechanical compression joint.
(Amend Coun. J. 10-14-21, p. 37722, Art. VII, § 5)