transitioning copper drain to PVC

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transitioning copper drain to PVC

Author: BigReg1500 (CT)

I'm helping someone do a bathroom and need to transition from 1.5" copper to pvc for a sink and tub drain. Would I be better off sweating a threaded adapter on each copper branch, or using a banded coupling for the transition?

The house is about 50 years old, so I don't want to have to chase the copper back any further than needed to find a solid enough section to make the transition.

Suggestions please? Thanks

Edited 1 times.

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Re: transitioning copper drain to PVC
Author: steve (CA) I would use the shielded couplings.
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Re: transitioning copper drain to PVC
Author: BigReg1500 (CT) I have a standard T torque wrench for the 5/16" band bolts. Does copper take a lower torque than pvc to avoid crushing the pipe?
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Re: transitioning copper drain to PVC
Author: hj (AZ) No, and you can get a "copper to PVC" shielded/banded coupling so you do not need a threaded adapter. The couplings do not conform to a "thread" very well, any way.
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Re: transitioning copper drain to PVC
Author: BigReg1500 (CT) Thanks, I initially meant should I go with a banded coupling or threaded adapter on the existing copper and a new one on the pvc. Sounds like if the copper is sound I'll be OK with the copper to pvc coupling without crushing the pipe.
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Re: transitioning copper drain to PVC
Author: george 7941 (Canada) When the OP mentioned "threaded adapter" I took it to mean FPT adapter on copper end and MPT adapter on PVC end and the two screwed together, with no banded coupling. OP confirmed my supposition while I was typing it out. Edited 1 times.
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Re: transitioning copper drain to PVC
Author: hj (AZ) If a banded coupling EVER damaged a copper pipe when it was tightened, then the copper was "worn out" any way and had to be changed. And a threaded adapter would NOT have worked either. Edited 1 times.
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