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Old 01-30-2013, 10:20 AM   #1
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What size cap for lp gas line?

I need to cap the line that used to go to my furnace. What size would I use? Any other tips on keeping this from leaking?
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Old 01-30-2013, 10:55 AM   #2
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You most likely need a 3/8 flair cap, but that is only my best guess. I have no idea where you took it apart and thus can't really tell you what you have. You may need a 3/8 flare plug or some other fitting.
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Old 01-30-2013, 05:09 PM   #3
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Its the line that screwed into the furnace line. Guess i can try 3/8 and 1/2 and see what fits
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Old 01-30-2013, 06:52 PM   #4
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Originally Posted by ALANSD View Post
Its the line that screwed into the furnace line. Guess i can try 3/8 and 1/2 and see what fits

Alan,

LP lines are typically connected using flare fittings. They make plugs and caps for male and female connections.

I'd think the fitting size would be 3/8" but a PO may have changed things up. Snap a picture of the disconnected fitting then head to the hardware store. A photo will help you, or the hardware guy with the selection process. Most of the "Box" hardware stores carry these.

As for leak detection, some soapy water applied with a spray bottle will usually ferret out any leaks. Of course an open flame works too, but I'd go with the soapy water spray.
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Old 01-30-2013, 07:17 PM   #5
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Thanks. I am sure its original as most everything on the trailer was. Headed to ace...the helpful hardware place ����
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Old 02-04-2013, 01:11 PM   #6
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ended up a 5/8 cap.. if anyone needs to know.
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Old 05-18-2013, 11:02 AM   #7
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I am in the process of renovating my Airstream and also removed the furnace since we only use it in Florida. I was thinking of just capping the supply line as well but thought about using it to supply LP to my portable outside grill. Has anyone tried to convert a supply line into a quick disconnect?
The vent for the furnace already goes through the skin... What do you think?
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Old 05-18-2013, 11:30 AM   #8
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If you don't use your furnace, why bother to take it out?

That's a relatively new trailer, and either you might change you mind about where you use it, or a subsequent owner might.
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Old 05-18-2013, 11:52 AM   #9
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I did think of all that but it would be easy to install again if needed. We do use our grill almost every day and a quick disconnect would be more useful and practical if it is possible to install.
We always camp in parks that have electricity. A small portable heater is all we have ever used.
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