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Old 07-08-2017, 05:04 PM   #16
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Re: Dreaded drop ear elbow failure


Ok. So clearly I am missing something about pipe sizing or just forgot. I got a cheapo tap and die set at Harbor Freight and the 1/2 inch tap is way to small. I am feeling optimistic about being able to tap/chase the elbow. I'll try and post a pic of what I'm looking at.

But what am I missing about pipe size?


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Old 07-08-2017, 05:15 PM   #17
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Re: Dreaded drop ear elbow failure


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Ok. So clearly I am missing something about pipe sizing or just forgot. I got a cheapo tap and die set at Harbor Freight and the 1/2 inch tap is way to small. I am feeling optimistic about being able to tap/chase the elbow. I'll try and post a pic of what I'm looking at.

But what am I missing about pipe size?




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See if this link will help.
You may find a decimal equivalent chart helps explain their decimal numbers.
http://www.engineersedge.com/pipe_schedules.htm

Last edited by SeniorSitizen; 07-08-2017 at 05:21 PM.
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Old 07-09-2017, 01:46 AM   #18
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Re: Dreaded drop ear elbow failure


You need a 1/2" NPT (national pipe taper) tap, that would be the correct threads for pipe and the common size for a shower arm.

A tap and die set will not usually include taps or dies for pipe threads, only NC or NF threads for bolts.
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Old 07-09-2017, 09:12 AM   #19
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Re: Dreaded drop ear elbow failure


Quote:
Originally Posted by ValleyFur View Post
Ok. So clearly I am missing something about pipe sizing or just forgot. I got a cheapo tap and die set at Harbor Freight and the 1/2 inch tap is way to small. I am feeling optimistic about being able to tap/chase the elbow. I'll try and post a pic of what I'm looking at.

But what am I missing about pipe size?


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IMO- you want a pipe extractor, not a tap.
If you have a drop ear that's brass then the threads are probably fine.
If you have a galv. 90 in the wall- perhaps the tap might be needed.

https://www.ridgid.com/us/en/pipe-extractors
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Old 07-09-2017, 09:59 AM   #20
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Re: Dreaded drop ear elbow failure


Any of your friends have a "in wall" inspection camera...... to see what the actual issue is.....?

If you do have a piece of broken shower arm in there.... and you engage an NPT tap.... you'll likely strip/bugger brass thread.

Why don't you at least grab a drop ear at your HD plumbing isle.... and run over and buy a wood dowel that just barely fits in that drop ear... and then test your shower to determine that it is , or is not, a broken off shower arm.
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Old 07-09-2017, 07:27 PM   #21
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Re: Dreaded drop ear elbow failure


Pipe extractor at Home Depot, $9.99
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Old 07-10-2017, 02:27 PM   #22
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Re: Dreaded drop ear elbow failure


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You need a 1/2" NPT (national pipe taper) tap, that would be the correct threads for pipe and the common size for a shower arm.

A tap and die set will not usually include taps or dies for pipe threads, only NC or NF threads for bolts.
Got it. I found and ordered a used 1/2 inch NPT tap with a long shank. I'll give it a shot when it arrives.
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Old 07-10-2017, 02:29 PM   #23
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Re: Dreaded drop ear elbow failure


For the suggestions that I should try a pipe extractor, I am trying to post pics of what I am looking at. Got at least one where the threads are in focus and it looks to me like some mangled brass that I may be able to correct.


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Old 07-10-2017, 03:07 PM   #24
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Re: Dreaded drop ear elbow failure


To me that looks like a piece of copper pipe broken off inside the ell. I'd try extractor first.
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Old 07-10-2017, 03:13 PM   #25
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Re: Dreaded drop ear elbow failure


Check the length of the threads on both ends of the arm, they should be the same unless some is left in the fitting.
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Old 07-10-2017, 03:19 PM   #26
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Re: Dreaded drop ear elbow failure


It looks as that has been acquainted with - Mr. Botch Job - several times over the years and needs to be replaced to be certain there isn't serious water damage in the future.
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Old 07-10-2017, 04:24 PM   #27
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Re: Dreaded drop ear elbow failure


This is another thing some inexperienced may not be aware of.
The farther the tapered tap is run into the fitting, to clean it and renew threads in this instance, the larger the tapered hole becomes, unlike straight threads.

This can cause a condition of too large a hole and the new arm will never tighten before it bottoms out. We don't want a half roll of TEF tape to be a bushing but only like 3-5 wraps to seal.

That's my story and I'm sticken toit.
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Old 07-10-2017, 04:56 PM   #28
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Re: Dreaded drop ear elbow failure


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To me that looks like a piece of copper pipe broken off inside the ell. I'd try extractor first.
Hard to tell..... but I'm with HK.....looks like that to me also...

I guess you can't get your finger in there.... but get something that just fits the drop ear... like a wood dowel..... and check if it is a broken shower arm.... and as NEAL says.... your old shower arm might give you a good guess.

And pay attention to SENIOR.... those are tapered thread... and in brass will cut easy.... if it is buggered thread.... you just want to chase the thread... not cut all new thread.
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Old 07-10-2017, 05:32 PM   #29
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Re: Dreaded drop ear elbow failure


Quote:
Check the length of the threads on both ends of the arm, they should be the same unless some is left in the fitting.
Now that's a thinking man.
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Old 07-10-2017, 06:08 PM   #30
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Re: Dreaded drop ear elbow failure


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Now that's a thinking man.
When you have screwed as many things as I have.
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