Thread: How to bend 40mm copper pipe 180° ?

So I have a project on the go..... I need to bend some 40mm copper pipe into a tight 'u' to make a wet back for a 'rocket stove' I have built.
It needs to be a tight bend, as the rocket stove is made from two D size oxygen bottles welded together.

I have acouple of copper 90° elbows to use, but thought it might be better to bend it... am I being paranoid about the brazing in the hot box?


Any of you clever shooters happen to be a plumber?