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Old 11-25-2014, 06:32 AM   #21
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LP Flex Line Inside the Airstream?

I was taught that the double flares were for high pressure apps. Seeing as the propane line has less than a 2 pound pressure a double seems like overkill. But error on the safe side. If you have the double flare part of the tool use it, it won't hurt. Flaring a double require an extra step.

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Old 11-25-2014, 06:33 AM   #22
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Old 11-25-2014, 09:56 AM   #23
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For what it is worth, I plan to put about 20psi on my lines to check for leaks. That will show up smaller leaks using soap compared to .5 psi of propane.

20 psi of air that is.


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Old 11-28-2014, 04:38 PM   #24
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Well I tried to use the original copper flexible gas line for my new refrigerator installation and discovered a crack where it go crimped.

So now that we know I need to use flexible copper, what size copper line do I need, what are the sizes of the female couplings and most importantly, where do I buy them cut and built to size?

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Old 11-28-2014, 06:27 PM   #25
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LP Flex Line Inside the Airstream?

Well you won't find a copper flex line, they are not made. You can purchase male pipe x flare adapters and use regular tube. Home Depot sells flex lines they come with the special metric adapters. Although the only size you may find is 1/2 or 3/4. I think what you want is 3/8. 3/8 flex line will be very hard to come by. I though they used it on fire place logs and lamp post. So you may want to try a fireplace shop or a place that sells propane lamp posts
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Old 11-28-2014, 06:30 PM   #26
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My Fridge uses 3/8" copper.

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Old 11-28-2014, 10:01 PM   #27
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LP Flex Line Inside the Airstream?

Go for a straight connection with flared 3/8" tube, ditch the flex line. It is just trouble.

You can leave extra length on the 3/8 tube to allow for a measure of flexibility.


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Old 12-06-2014, 08:47 PM   #28
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Flex line or soft copper?

The copper tubing that comes in a coil (10 or 20 feet usually) from a hardware store is smooth, is soft enough to bend, and I think that is what one might, incorrectly, call "flex" tubing. The flex tubing is not smooth, it has coiled ridges and pre-attached end fittings, and is not good for trailer propane (as mentioned). The soft copper line can bend, but be careful not to kink it! It should be slowly bent. 3/8 inch tubing will usually bend to a radius of, oh let's say a gallon tea jug, before one must be VERY careful not to kink it.
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Old 12-06-2014, 09:08 PM   #29
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If tight bends need to be made and the piece of tube is removeable when bent, filling it w/ fine sand and taping the ends over w/ duct tape will support the tube during the bending process.

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Old 12-06-2014, 09:12 PM   #30
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Or you can get spring benders that go over the tube to prevent linking when you bend it tight.


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Old 01-11-2015, 04:32 PM   #31
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I am an extreme novice ( or was) when I installed my water heater replacement. It required some serious tube bending - almost 90 deg at about a 2" or 3" diameter. Spring benders saved my bacon- takes patients tho!



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