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Old 11-12-2013, 07:46 AM   #11
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It occured to me that I didn't answer the 2nd part of the original post for brass.

If you are not satisfied that the built in secondary check seal offers enough safety for garage storage there is a brass fitting alternative. You could buy a left hand thread connector and cap it using a pipe cap.

Here is one example.

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http://propanewarehouse.com/cylinder...ls.asp?ID=3002

A local industrial gas supplier or welding supply store would likely have them in stock. Another possible supply would be someone's discarded old style gas grill by the side of the road. Be quick though or the scrappers will beat you to it.

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Old 11-12-2013, 03:28 PM   #12
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Yeah the old style valves can no longer be legally filled and the new style, well I`ve never seen one leak yet. The old style you could turn on the valve with nothing attached to it and it would release propane but not the new OPD valves......
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Old 11-12-2013, 07:15 PM   #13
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Quote:
Originally Posted by Crabman View Post
... well I`ve never seen one leak yet. ......
Nor have I.

To be clear, I was just trying to provide the information for a brass secondary plug as requested. Personally I wouldn't worry.

The new propane valves are extremely reliable. That said, so were the old style valves. The newer Acme style design does away with the confusing and harder to use (for the general public) left hand fine thread on the connection. The Overfill Prevention Device OPD came after the Acme style valve was introduced. As was mentioned, the older Acme valves do not have the three corner valve handwheel (knob) design and cannot legally be refilled.

A quick search found this link for anyone interested in more information.

http://www.naturalhandyman.com/iip/i...ll/infopd.html

There are many specific compressed gas bottle connections in the CGA Compressed Gas Association standards. The left hand thread is reserved for flammable gas. The Acme style connector was a method around that left hand thread issue. That said, they haven't eliminated the ability to be able to use the left hand thread connector on Acme style valves. I doubt that they ever will eliminate it as that connection design remains a standard.

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Old 11-12-2013, 07:27 PM   #14
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I still have a few devices that require the backward thread connection, an old propane distribution tree and a couple MR heaters that mount on the tank. As mentioned the new valves still accommodate those devices.
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Old 11-13-2013, 07:45 PM   #15
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Thanks you for the many in depth replies. They are most appreciated. THANKS!
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