Lifehacker linked to an instructables article about multi-angle sprayer
http://www.instructables.com/id/How-to-make-a-spray-bottle-that-works-in-any-direc/
While using bolts is a bit cheaper, this seems like they might have a tendency to slip off if not sized right or as the tubing ages. I recognized a similar device from RC model fuel tanks called a clunk.
Its designed for model fuel so it shouldn't corrode, not too expensive (a few dollars) and slips into the aquarium tubing without any modification.
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