Brassware and compression

Brass and compression fittings can go on both copper and iron. All you need is an adjustable spanner and a pair of grips. A little bit of joining compound on the outside wouldn't do any harm either! These are brass fittings. You can also get male fittings where the thread is on the outside with these you would need some kind of ptfe tape. You can also get female fittings with the thread on the inside. Male and female brass fittings are normally used in the bathroom for showers or as tap connectors. They can also be used to convert a bit old iron pipe to copper.