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Old 11-13-2016, 06:52 AM   #1
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Need to change out this pipe...


Hi all,

I don't really know what this is length of pipe is called...hence the title of this post! Please see the attached pic.

I am installing a pedestal sink to replace a sink that was installed in a countertop; the sink was catty-cornered, so one of these pipes was longer than the other, and it is sticking out so much that it's interfering with the pedestal placement. It goes into the wall and appears to be threaded into another pipe.

I assume I can find a shorter, threaded version of this pipe at Home Depot?

Also, since I believe its the original plumbing and therefore 40+ years old, any tips on loosening the damned thing? There is wainscoting paneling on the wall, and I'm not looking to remove it or have to open the wall.

Lastly, would I install the new length with plumbers tape?

Thanks very much!
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Need to change out this pipe...-waterstop-typical-installation.jpg  
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Old 11-13-2016, 07:03 AM   #2
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Re: Need to change out this pipe...


They should have a shorter length. The question becomes is the actual like that you need right in between premade sizes. You may have to have a specific piece cut and threaded for you. I prefer pipe dope over Teflon tape on cast-iron.
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Old 11-13-2016, 07:08 AM   #3
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Re: Need to change out this pipe...


The short pipe you are referring to is called a ( Nipple ) and is commonly available in 1" increments for that length. Shorter lengths are sometimes available in 1/2" increments.

No guarantees in simply un-screwing with a pipe wrench to remove 40 year old pipe.

Yes, use Teflon tape to install the new pipe.
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Old 11-13-2016, 07:12 AM   #4
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Re: Need to change out this pipe...


Quote:
Originally Posted by SeniorSitizen View Post
The short pipe you are referring to is called a ( Nipple ) and is commonly available in 1" increments for that length. Shorter lengths are sometimes available in 1/2" increments.

No guarantees in simply un-screwing with a pipe wrench to remove 40 year old pipe.

Yes, use Teflon tape to install the new pipe.
Thanks for your reply. If I cant loosen the pipe...what's the alternative? I am going to assume it would have to be cut and threaded in place...?
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Old 11-13-2016, 07:15 AM   #5
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Re: Need to change out this pipe...


Call a plumber at that point.

Have you drained the pipes? You don't want all that water dumping into the wall cavity.
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Old 11-13-2016, 07:18 AM   #6
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Re: Need to change out this pipe...


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Call a plumber at that point.

Have you drained the pipes? You don't want all that water dumping into the wall cavity.
Haven't drained the pipes. I shut the water off when I removed the old sink and put the new one in...and I ran into this problem when placing the pedestal for the sink
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Old 11-13-2016, 07:55 AM   #7
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Re: Need to change out this pipe...


Going to need a pipe wrench to unscrew it. Vice grips or pliers ain't going to do it.
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Old 11-13-2016, 08:14 AM   #8
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Re: Need to change out this pipe...


a pipe wrench and might need to slip a pipe over the handle for extra leverage.. dont be surprised if that pipe you replace is full of corrosion... 40+ years old... it might be time to start saving up for a repipe
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Old 11-13-2016, 08:39 AM   #9
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Re: Need to change out this pipe...


My post comes from personal experience, most of it unpleasant. A 40 year old pipe is likely to be frozen in place, probably corroded. Even if you can remove the pipe, it is going to be difficult to clean the female threads in the wall to get a good seal with the new pipe, and if it leaks in the wall after installation, you have a serious problem. If the nipple is internally corroded, you have the potential to twist the nipple with the pipe wrench, ruining the nipple, and ruining the rest of your day.

Consider the option of cutting the existing nipple to length with a hacksaw or pipe cutter, then threading the end using a plumbers die. For a small diameter nipple, you can cut the threads using a hand operated die rather than a power tool (I have done it several times). You can rent the die and cutter if you don't want to buy one. Make sure you fully understand how to cut the threads, you are only going to get one chance to do this, so read the directions and go slowly. Use the recommended cutting oil when you thread the nipple.
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Old 11-13-2016, 06:34 PM   #10
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Re: Need to change out this pipe...


Does anyone know whether this pipe galvanized iron or is it copper?
Everyone seems to be assuming it is iron.
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Last edited by hkstroud; 11-13-2016 at 06:36 PM.
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Old 11-14-2016, 08:01 AM   #11
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Re: Need to change out this pipe...


Given the drawing he reference, I am assuming it is black pipe, but you ask a valid question.

How about a picture @AM146 ? That will help us confirm what you are working with.
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