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Author:
ddbbp (KS)
I have a galvanized/cast? 45' on a drain line. It currently has a male pvc adapter threaded into it. I need to cut the plastic to couple in a new piece of pipe downstream of this.
Should I remake that connection at the steel 45' with a pvc male adapter? Or is it better to thread some sort of nipple on the 45' and just use a banded coupling for easy removal later?
I like the banded coupling idea but I am unclear on what type of nipple to use to attach to.
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Author:
hj (AZ)
quote; I am unclear on what type of nipple to use to attach to.
A threaded one. Either a steel nipple or a PVC nipple cut in half so you have a plain end to connect to.
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Author:
ddbbp (KS)
Ive never seen a pvc nipple, but I didn't think plastic threads was ok with metal.
As for a steel nipple, I assume I would use a galvanized nipple and attaching the banded coupling over the threads is ok with steel? Is that correct?
Or is the easiest just to use a plastic male adapter?
In other words... what would a plumber do? WWPD
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Author:
KCRoto (MO)
This plumber would cut out the whole galvanized and cast drain and replace the whole thing with pvc if it was my house. A diyer will find the banded couplings easier to work with than trying to thread pvc into a cast iron. Make the connection in a straight run of pipe, not at a joint.
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Author:
ddbbp (KS)
My first thought was to replace it as well but the 45 is in the basement, where it stubs out of the floor. The rest of it above is on an exterior wall going to a kitchen sink which would mean I have to redo the kitchen drain as well... too much work.
So galvanized nipple and banded coupling over threads is OK?
Do you think a 60 year old elbow will play nice and allow a new metal fitting to be screwed into it?
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Author:
KCRoto (MO)
If you could unscrew what was in it, you can screw something back in. Be sure to use dope on the threads to both seal and lubricate the joint as you tighten it. A fernco to threads isn't a good choice, but cutting the threads off a longer nipple and banding to smooth pipe is ok.
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Author:
bernabeu (SC)
Ferncos are NOT code compliant ANYWHERE
Shielded rubber couplings ('no-hub clamp') are
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"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638
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Author:
ddbbp (KS)
Is a pvc male adapter screwed into galvanized elbow a bad choice? That is how it is right now.
My other choice would be to stear clear of this joint and use a pvc repair coupling down stream of it.
Once I cut the section out I need to replace, there will be no horizontal movement of the pipe without either removing it from the main or removing it from the cast elbow I mentioned..... without the horizontal movement, the new portion of pipe will butt up against my cuts (ie repair coupling or banded coupling in case I have to remove it later).
Would that be the smarter choice?
Edited 1 times.
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Author:
hj (AZ)
I would use the PVC nipple cut in half even though YOU have never seen one.
Edited 1 times.
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Author:
hj (AZ)
quote; Would that be the smarter choice?
There is NO "smarter choice" because there is more than one way and they are mostly equal.
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Author:
ddbbp (KS)
"I would use the PVC nipple cut in half even though YOU have never seen one."
If I am going to screw plastic into metal, why wouldn't I just use a pvc male adapter and not pay for the fernco?
Keep in mind this joint is sound, its not leaking. Do you feel I shouldn't touch it and instead use repair couplings or banded couplings? Do banded fernco couplings have a stop in the middle?
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Author:
hj (AZ)
One reason is that a PVC male adapter has to be the most fragile fitting in the plumbing industry. If ANY fitting is going to snap off, it will most likely be a male adapter.
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Author:
ddbbp (KS)
I only see sch.80 grey nipples... are their sch 40 nipples?
Do banded fernco couplings have stops in them? Can I use them like a repair coupling?
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