We use a few copper fittings to make bits for our own Homebrew microbrewery stuff.
We've put a few of the common ones on here.
Push fit, for making a mashing flange.
They don't need to be soldered because you're going to cut slots in the pipe anyway!
Plain Copper pipe. Push fit into the 22 mm fittings.
To be watertight you would have to solder it!
Push fit is fine for the mash flange
