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So I picked up the Mr. Heater refill valve a couple months ago. It was 16.99 on sale, and it's already paid itself off. If you get a BBQ tank from Costco for next to nothing, then it allows you to refill your Coleman or other brand tanks for under .50$ per tank!
Just refrigerate your small tanks, and leave your BBQ tank in the sun to create the required pressure differential, and enjoy cheap refills!
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