A. 
All conductor pipes must be properly connected with a storm sewer.
B. 
When within a house or building, the leader must be of cast-iron, bell-and-spigot known in commerce as extra-heavy, galvanized wrought-iron, galvanized steel pipe, cast-iron screw pipe approved, brass and copper pipe approved; spouts shall be copper or lead with ferrule or solder nipple or other conductor heads approved by the Examining Board of Plumbers.
C. 
Rainwater leaders must never be used as soil, waste or vent pipes; nor shall any soil, waste or vent pipe be used as a rain leader.
D. 
Extra-heavy cast-iron pipe must be used to connect to an outside rain leader, and shall extend from elbow to at least six inches above grade the same size as title drain with hub end.