Same here, a big 75/25 and argon bottle, I take the empty to Airco and they give me a full one. Getting a re-fill is a pita. My experience with small bottles is that they only run out after 5pm or on Sunday. My technique is to hang my hood on the gas bottle and close the valve. Forgetting to close the valve on a full large bottle is a lesson you will generally learn the first time :-)
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