pvc male adapter to cast/galvanized

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Old 09-08-14, 03:40 AM
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pvc male adapter to cast/galvanized

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I had to replace the pvc male adapter that is screwed into the cast/galvanized? elbow. I had limited space to turn a wrench. I went hand tight and then about another half with pipe dope on the threads... is that sufficient? What is the proper tightness for plastic to metal like this? I feared breaking the flimsy male adapter....
 
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Old 09-08-14, 04:54 AM
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As long as it does not leak you should be good...

I have a very large basin wrench for situations like that....
 
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Old 09-08-14, 05:47 AM
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I have a very large basin wrench for situations like that....
But how would you back up the other pipe?

I figured if that elbow had to be replaced I would be screwed.... (thinking cutting it out or breaking it is better left to a pro?)
 
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Old 09-08-14, 05:55 AM
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But how would you back up the other pipe?
Not understanding...

Loosen the rubber coupling and grab the male adapter thats screwed into the cast with a basin wrench..

 
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Old 09-08-14, 08:58 AM
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pvc male adapter that is screwed into the cast/galvanized? elbow
I think OP is concerned cast iron elbow will be disturbed or break loose if he tightens male adapter. He's wanting to hold elbow and tighten adapter at same time.

Not necessary as pointed out. If it doesn't leak, you're good. Pipe's not under pressure.
It doesn't take a lot of torque to set an adapter.
This would be a good idea on a gas line or other piping.
 
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Old 09-08-14, 09:23 AM
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No, im not concerned I am going to break a cast iron elbow with a flimsy male adapter. I was referring to the cast iron elbow itself... how would you remove it if you had too??....
 
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Old 09-08-14, 09:33 AM
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Its leaded in.. Need to melt lead..

Or snap/cut line above the ell and convert to PVC. Use a mission coupling similar to the rubber one you have now..

The mission's convert cast to PVC because the OD's are different...
 

Last edited by lawrosa; 09-08-14 at 10:40 AM.
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Old 09-08-14, 10:29 AM
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If you want to cut cast iron pipe above the ell, here's an excellent blade for reciprocating saw:

Attachment 37895

It's diamond grit and cuts very well.
 
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Old 09-08-14, 10:55 AM
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Im not sure that's cast iron. If you look close the pipe is greyish and I believe it is threaded. Plus the elbow is female threaded too.... I believe that's galvanized then?

That also disappears into an interior wall... kitchen sink is directly above it. The photo makes it looks easier than it is... I don't see 'cutting or snapping it' happening from below.
 
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Old 09-08-14, 11:05 AM
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Why do you want the ellbow gone?
 
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Old 09-08-14, 11:16 AM
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Why do you want the ellbow gone?
I didn't say that. Just wanting to know what I was facing if say the threads were damaged or the thing rusted thru.

So can you say for sure its cast iron?
 
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Old 09-08-14, 11:22 AM
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I blew up your picture and didn't see any signs of leaks or seepage around elbow.
I say leave it alone.
If your sink above is not draining properly, changing this elbow will most likely not fix the problem.

What is your goal here?
 
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