Just out of curiosity, why the need for the clear PVC, other then to watch the reaction? Aside from that, it offers no real benefit. As Nokturnal mentioned, by drilling the hole in the side of the reactor just slightly smaller then the tubing will seal it. If you're particularly concerned with a leak, just run a bead of silicone sealant around it.
I printed Rex's guide out, went to Lowes, and walked out with everything for the reactor for around $20.
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