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I really like the idea of cold crashing, though. I might try just fill a big ziplock with CO2 and attach it in place of the airlock.
I drilled and installed a port to the Home Depot bucket lid to hook up the CO2 tank. Every few hours I add CO2 until airlock bubbles. Pretty simple if you use plastic. Used this fitting, a grommet, and removable plug which I made myself since none available at LHBS.
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