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Old 05-07-2010, 09:59 AM
muldoonthief muldoonthief is offline
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Join Date: Jul 2003
Location: North of Boston
Posts: 9,815
Which way are you turning it? It sounds like the valve is already open but the OPD valve wasn't letting any gas flow because it wasn't hooked up to a fixture - see here. Once you attached it to your grill, it opened the safety valve and let the gas through. I'd try closing the valve.

Is it a new tank you bought, or one of those Blue Rhino exchangeable tanks? Either way, if you can't close the valve, I'd bring it back - no point losing all your propane or having a safety issue when you should be able to get a new tank for free - one that won't close is clearly defective.