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Old 10-11-2011, 05:05 PM   #1
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threaded unions inside wall


is it permitted to have threaded unions (e.g. regular or dielectric) inside a wall? someone told me it was not cause they are more prone to leaking. i plan to have some dielectric ones (copper->galvanized) inside my walls.

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Old 10-11-2011, 07:21 PM   #2
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threaded unions inside wall


Good question....I'm going to say no...unless there is access to the union.

That question came up awhile back regarding a P-trap in the wall...the guy wanted to use the threaded type....only allowed in there is an inspection door or other access....at least that is what was told....

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Old 10-11-2011, 07:49 PM   #3
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No any fitting that you can take off with channel locks or wrench can't put behind walls
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Old 10-11-2011, 10:48 PM   #4
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The answer is no. What is the reason you want to have unions in a wall, instead of straight pipe?
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Old 10-11-2011, 10:57 PM   #5
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because i want to have copper pipe inside the wall and galvanized outside for the looks. it is radiator pipe. i do not like copper pipe going straight into the radiator or even exposed whatsoever (like having a dielectric union outside connecting copper and galvanized). but inside the wall, obviously it is more convenient to have copper as it is easier to put together.

how about if i make a service panel entrance to where the unions are?

Last edited by amakarevic; 10-11-2011 at 11:05 PM.
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Old 10-11-2011, 11:32 PM   #6
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Dialectic unions are not needed on hw heat systems. You can join copper to iron by using standard mip/fip adapters.
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Old 10-11-2011, 11:43 PM   #7
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Dialectic unions are not needed on hw heat systems. You can join copper to iron by using standard mip/fip adapters.
oh man ... really ? that would be SWEET !! i thought dielectric unions are used to prevent corrosion on both ends. so you're saying i can do FIP->MIP (actually more like FCP->MIP) copper directly to galvanized steel ?

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Old 10-12-2011, 10:28 AM   #8
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threaded unions inside wall


Install a copper drop ear fitting in the wall and then stub out with a galvanized nipple.
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Old 10-12-2011, 11:08 AM   #9
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Install a copper drop ear fitting in the wall and then stub out with a galvanized nipple.
but will it not work if i do galvanized male into copper female directly?
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Old 10-12-2011, 02:05 PM   #10
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Yes, you can do that. I suggested the drop ear because it can be fastened to a framing member for additional support. It's just personal preference.
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Old 10-12-2011, 02:11 PM   #11
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thanks a bunch, man !! what would i do without you all?
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Old 10-12-2011, 02:24 PM   #12
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threaded unions inside wall


another question: do you think pipe dope can sustain high heat in close proximity? what i wanna do is twist the copper female onto the galvanized male and then sweat it to the copper pipe because i don't have room to rotate the whole assembly on the galvanized side? it would really s**k if i had to take it all apart.
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Old 10-12-2011, 02:30 PM   #13
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Quote:
Originally Posted by amakarevic
another question: do you think pipe dope can sustain high heat in close proximity? what i wanna do is twist the copper female onto the galvanized male and then sweat it to the copper pipe because i don't have room to rotate the whole assembly on the galvanized side? it would really s**k if i had to take it all apart.
No it will just burn up and will eventually bond to the pipe and if you have pipe dope u have teflon which will burn too.
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Old 10-13-2011, 02:53 PM   #14
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Quote:
Originally Posted by amakarevic
another question: do you think pipe dope can sustain high heat in close proximity? what i wanna do is twist the copper female onto the galvanized male and then sweat it to the copper pipe because i don't have room to rotate the whole assembly on the galvanized side? it would really s**k if i had to take it all apart.
Might be a better idea to turn the copper with an elbow and a short length of pipe in the wall. This could give you more room to work on the outside when you're making the connection. Would surely save you some headaches if you ever need to disassemble that galvanized piping. Just a thought.

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