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The size of the PVC is not that critical. You can get by with anything in the approximate range. Thin wall is slightly better as it will need less unblocking with heavy use.The impellers NEED a hole in the middle rather than at the edge. You need that lip on the edge to stop the fluid being flung back out when centripetal force is pushing the fluid to the outside of the tube.
Bungard sell a smallish spray etcher for a few $K
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