I use the 4" galvanized pipe from the home improvement store. I use
tin snips and a crimping tool (that I made) to form the ends where
flex tubing can be attached. The flex pipe is not cheap. Someday
I'll splurge and buy some clear flex tubing. The flex stuff with the
spiral wire in it helps dissipate the static charging when the wire is
grounded. Smooth pipe has less air friction, but can't be moved
around--take your pick.
No matter what/how you do it, you will be cursing it some of the time.
I have a permanent DC setup using 4" PVC pipe (SCH 40), which is
reasonably priced, and easy to work with. Final connections to
machines are with blast gates and flex hose.
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