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Copper is the main metal used for this purpose.
It cleans the water, mainly of sediment and metal particulates which are bad for your pipes.
PVC pipes are less expensive and easier to repair. Metal pipes are more expensive and more difficult to repair.
The drain metal pipes are usually coated and galvanized because of the hard water.
Bagpipes. And as far as my knowledge goes that is it. Uilleann pipes and an accordion are also "squeeze" instruments.
Piano, pan pipes, and piccolo
reed pipes i think
Copper
In Mesopotamia, the instruments used were the drums, lyre, the harp, the reed pipes and the Oud
Most drain pipes are made of copper
Flexible pipes can protect against somemovement.
Pipes, wires.