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Old 02-04-2013, 10:50 PM   #1
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Propane tank threads, old or new style

I forgot to look at the type of threads on my propane tank this weekend when I visited the RV.
Does anyone know which type of threads are on a 1999 Rexhall Aerbus 32MBSL? I want to buy an Extend-a-Flow to run my Weber Q from the main propane tank on the RV. There are two kinds of threads. Old school and the newer ACME type. I don't know which one I have. Thanks in advance for the help.

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Old 02-05-2013, 04:17 AM   #2
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Very likely has the old type .
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Old 02-05-2013, 08:04 AM   #3
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Old 02-05-2013, 09:41 AM   #4
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It does not matter.. The old fitting will work on most all the new tanks and the Extend-a-flow has a dual fitting so it will work with most all hoses as well.

The ACME fitting, normally (The new one) has both external and internal threads.. THE Prest-O-Lite (POL) fitting, also known as a Put On Left since it is a left hand thread, is the internal thread on the Acme Tanks.

To be sure, check your tanks,

The ACME is a big plastic nut that fits OVER the tank valve, the POL is a smaller brass fitting that screws into it.

There are a few odd ones but the odds you have one of those approach zero. (As in one in several million)
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Old 02-05-2013, 09:57 AM   #5
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Reference to propane tank threads and valves.

I found this to be helpful. I'm going with the guess that it is the old style thread- POL.

http://www.google.com/url?sa=t&rct=j...bO5qb6Vku2vFIg
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Old 02-05-2013, 10:10 AM   #6
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Sorry to hijack but I have a question about hooking one of these Extend-a-Flow devices up.

How do you connect it and where do you connect it to in the line? I have dual propane tanks so I have two fill spouts.
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Old 02-05-2013, 12:28 PM   #7
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It goes between the tank and the pressure regulator. takes a bit of plumbing. Are your two tanks separate? You would only need to put the Extend-a-flow on one tank.
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Old 02-05-2013, 01:17 PM   #8
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Ok that makes sense, I was hoping it would be easy like at the fill spout

Can you just unscrew the regulator and then screw in the T to the regulator and then run a hose from the T to a mount by the fill spout for easy access?

I assume once I shut the valve for the LPG tank it won't backflow once I unscrew I adapter?

Yes my two tanks are seperate. One runs the generator and the other runs the LPG accessories.
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