When I was at Fry's Electronics I picked up a nifty air blower for electronics that uses the small CO2 cartridges like you'd find for the tap a draft systems or the old bb guns. I just dunk the whole thing in some starsan and use it to flush the receiving carboy with CO2 and then rack into it, pushing any remaining lighter oxygen out. I figure that should be pretty useful in preventing oxidation as it ages. The blower cost me about 10 bucks.
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