punkin wrote:.... the pipe fits INSIDE the flange?
Yes Punkin. Its the strongest way. I tried to pattern it after any true copper fitting. But the wall thickness is a little thicker than a standard forged fitting.
The Outside Diameter of copper pipe stays the same accross the different schedules, or wall thicknessess, of the pipe. I don't think this fitting will work with DWV (thin walled Drain Waste and Vent) type pipe. I only know USA copper pipe so it may be different to you metric folks.