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Old 09-22-2013, 08:53 PM   #1
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Galvanized nippe rusted through


I just bought a house that was built in 1948. The valve under the bathroom sink was leaking, so today i decided to try to fix it. After getting the valve off, i figured out that the problem was probably caused by the nipple being too far rusted out. Im half tempted to just rip out the cabinet, open up the drywall, crawling under the house and replacing as much of the galvanized pipe as i can with pex, but on the other hand im planning a pretty substantial remodel in the next year or two, and itd be nice to do a quick easy fix for now. If i just put a pipe wrench on the nipple and start spinning, what are the odds that the nippe will just unthread and i can just thread in a new nipple?

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Old 09-22-2013, 09:03 PM   #2
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Galvanized nippe rusted through


The odds? 50/50 ? What choice do you have?

Be careful and try it--you are right--1948 the whole system is past due for changing.

Here is a life saving part----the 3/4" compression fitting.
This common repair part allows you to saw off a 1/'2" galvanized pipe--

Add the compression fitting---add 3/4" copper to the other side--bush down to 1/2" copper and make a replacement ----

This is a handy thing to know if the pipes start breaking off when you unscrew.

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Old 09-22-2013, 09:12 PM   #3
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Galvanized nippe rusted through


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The odds? 50/50 ? What choice do you have?
I wasn't sure, on one hand i could see them always unthreading just fine, i mean after all, they are threaded, its not like they are welded. On the other hand, i could see them breaking off nearly 100% of the time, I mean, 65 years of rusting together, and its so bad, its formed a hole in the pipe, theres no way those pieces are coming apart. I figured you plumbers must have some kind of % on success rate.


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Be careful and try it--you are right--1948 the whole system is past due for changing.

Here is a life saving part----the 3/4" compression fitting.
This common repair part allows you to saw off a 1/'2" galvanized pipe--

Add the compression fitting---add 3/4" copper to the other side--bush down to 1/2" copper and make a replacement ----

This is a handy thing to know if the pipes start breaking off when you unscrew.
I think i'll just go this route. I don't care if it looks cobbled together for now. Probably not next summer, but the one after im planning to do a major addition, move the kitchen, add some bathrooms. It'll be a much better time to re plumb the house. Not to mention i have about a million projects to get done on this house, and no money to do them, since i just spent it all putting 20% cash down.
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Old 09-22-2013, 09:22 PM   #4
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Galvanized nippe rusted through


That fitting has been a life saver----I've been in houses that were so corroded that every pipe I tried to unscrew just snapped at the threads.

An old plumber taught me that long ago----
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Old 09-22-2013, 09:48 PM   #5
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Galvanized nippe rusted through


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That fitting has been a life saver----I've been in houses that were so corroded that every pipe I tried to unscrew just snapped at the threads.

An old plumber taught me that long ago----
I've never tried a comp. fitting but if you say it will work- I'd say go for it until you can get to the pex re-pipe.

I bet if you try to wrench that nipple- it's a goner...

The other option is to get a high quality nipple extractor- you won't find it at a box store either. More likely at a good tool shop.
If a pipe wrench fails, cut the nipple close to the fitting and use the extractor. Even that is not 100%
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Old 09-22-2013, 10:00 PM   #6
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Galvanized nippe rusted through


i went and got a fitting but it doesn't fit the pipe . Its too large Good thing i hadn't sawed the pipe off yet.

The one i found was 7/8 OD to 3/4 NPT. Im going to try an actual plumbing supply house instead of a box store tomorrow.


im thinking about ordering from here:
1/2" Compression x 1/2" MIPS
http://www.plumbingsupply.com/galvan...-fittings.html

Last edited by jimmy21; 09-22-2013 at 10:39 PM.
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Old 09-23-2013, 06:08 AM   #7
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Galvanized nippe rusted through


I don't know if there is a compression coupling that will fit a 3/8" nipple---I've only used them on 1/2" and 3/4" galvanized----
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Old 09-23-2013, 09:29 AM   #8
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I don't know if there is a compression coupling that will fit a 3/8" nipple---I've only used them on 1/2" and 3/4" galvanized----
Its a 1/2" nipple. I think the fitting I got was made for plastic. It was only slightly too large.
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Old 09-23-2013, 12:07 PM   #9
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Galvanized nippe rusted through


I wouldn't trust a compression fitting on galvanized at the end of a line. The down side is too great - if it blows off you have a huge, expensive mess.
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Old 09-23-2013, 05:31 PM   #10
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Galvanized nippe rusted through


Those compression fitting are very strong,with a rubber ferrule ---these are made for the purpose.
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Old 09-23-2013, 05:46 PM   #11
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Galvanized nippe rusted through


Sounds insane but I found if I tighten first they usually come out easier. If your nipple still has meat.
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Old 09-23-2013, 05:56 PM   #12
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Sounds insane but I found if I tighten first they usually come out easier. If your nipple still has meat.
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Old 09-23-2013, 11:19 PM   #13
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Don't give away all our trade secrets
Too late, now all the meaty nipples are going to be mine!
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Old 09-24-2013, 12:31 PM   #14
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Galvanized nippe rusted through


mike, are you talking about a dresser fitting or a compression fitting?
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Old 09-25-2013, 06:50 AM   #15
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Galvanized nippe rusted through



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