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.
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