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Old 06-05-2012, 10:53 AM   #1
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connecting 3/4 tube with 3/4 pipe


I need to reconnect a suction line that was cut, i'm having a hard time finding a 3/4 ID copper coupler locally. I don't have and don't want to buy a swaging tool for the tube. I was wondering can i use a piece of 3/4 ID pipe (standard plumbing pipe) as a coupler for 3/4 OD lineset? if not why? Thanks, Andrew

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Old 06-05-2012, 11:02 AM   #2
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connecting 3/4 tube with 3/4 pipe


The problem with standard plumbing piping is that it has a thinner wall thickness than refrigeration tubing or piping. If you asked for type L or type K piping then you could use it as it has a thicker wall than standard type M plumbing copper.

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Old 06-05-2012, 11:09 AM   #3
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connecting 3/4 tube with 3/4 pipe


Quote:
Originally Posted by aselby View Post
...i'm having a hard time finding a 3/4 ID copper coupler locally.
Where are you looking?
Have you been to any HVAC supply places?
(when there ask for the silver solder and flux you'll need
and the pump and gauges and a tank of gas too)

Last edited by TarheelTerp; 06-05-2012 at 11:11 AM.
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Old 06-05-2012, 11:49 AM   #4
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connecting 3/4 tube with 3/4 pipe


All the Hvac supply stores will only sell to a business. I ordered some from Grainger but they were for 3/4 pipe. I have everything to do the work besides the coupler. I'm in the NW suburbs of Chicago if you have a suggestion where to get one. Any other opinions on the 3/4 copper pipe, I was going to go with the thicker wall pipe and the 2 ends of the tube will be butted against each other.
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Old 06-05-2012, 12:14 PM   #5
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connecting 3/4 tube with 3/4 pipe


Take your needle nose pliers and reem the heck out of one side, to make it a fEmale, and shove the other end in in. Might want to remOve any metal shavings first, before you stick them together.

If you need more slack then what you can get with just the needle nose then heat up the copper and then reem the heck out of it.

No coupling needed.
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Old 06-05-2012, 12:20 PM   #6
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connecting 3/4 tube with 3/4 pipe


I've gone as far as to actually snip one 3/8's line so it split open at the end, shove the other side into it as far as I could get it and braze the heck out of it.

No problems, other than it's not the right way. And that was the high side, much more pressure than the 3/4" low pressure side.

Just after I found a coupling in the truck...
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Old 06-05-2012, 12:22 PM   #7
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connecting 3/4 tube with 3/4 pipe


why is that better than using a piece of pipe as a coupler?
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Old 06-05-2012, 01:06 PM   #8
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connecting 3/4 tube with 3/4 pipe


Quote:
Originally Posted by aselby View Post
All the Hvac supply stores will only sell to a business.
I'm in the NW suburbs of Chicago...
That's insane.
I can see not selling gas or maybe even coils/condensers...
but not selling fittings is just insanity.
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Old 06-05-2012, 01:39 PM   #9
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connecting 3/4 tube with 3/4 pipe


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Originally Posted by aselby View Post
why is that better than using a piece of pipe as a coupler?
I didn't say better or worse but since you inquired one braze versus two. Neither way is correct, but when in a jam..

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