You can also buy new pipe; it's relatively inexpensive. Lowe's sells 10-foot lengths of schedule 40 PVC Charlotte pipe for ...

Use 4-in.-diameter 'Schedule 40' PVC, which is available from home centers. Here's how to do it: Lift the front edge of the ...

The build uses PVC pipes for both the barrel and the air ... which is nicely within the 280 PSI rating of the 2″ Schedule 40 PVC being used. Though, as they note, the connections in the design ...