Quote:
Originally Posted by Tank2010
We are playing with the idea of using a sprinkler system valve as a quick release valve for releasing the air out of the cylinder quickly. We were wondering if someone has done this and would mind sharing or is it against the rules? 
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It is against the rules.
HOWEVER
We have done it, we are very satisfied with the results, and we plan to continue using the exact system you described in the future.
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On our T-shirt cannon.