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I use the 4" PVC drain pipe. It is much lighter than normal pipe, cheaper, and already has many holes in it. If you use the flat style rigs, I've heard of people using pizza boxes, with a used anchovie pizza box being the prefered flavor. On a second note, central vac pipe is great for shipping rods if you have to. It is also good for storing about a half dozen tubes. Just cut to your desired length.
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