Copper: one of the most common plumbing materials, although gradually being replaced, mainly used for water conveyance.

Also be aware that directly joining different types of metals — in this case, galvanized steel pipe and copper — can cause ...

Straight copper pipe, at least 30cm long. 15 or 22mm diameter central heating pipe works well. (A hardware store may lend you a piece for a minute just to try this out) A circular neodymium magnet ...