Copper

Copper pipe and fittings are used alot mostly for pneumatic cannons. Copper pipe can hold way more PSI then PVC (it can hold over 300PSI easily), this is the main reason most people use it. Often copper pipe is used together with a QEV. Most of the times copper pipes and fittings are soldered together, but some people use epoxy too. Threaded fittings and pipe are ofcourse just screwed in with the use of PTFE tape or pipe dope.

The disadvantage of copper pipe is that large bore copper pipe (1" and larger) is not available everywhere and that its quite pricey too. Due to this size most copper cannons are using marbles as ammo.