Connecting Bathroom Sink Drain to 1 1/2" Copper Pipe

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Old 06-21-17, 03:22 PM
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Connecting Bathroom Sink Drain to 1 1/2" Copper Pipe

Looking for the best method to connect my new sink drain to a 1 1/2" copper drain pipe. I've done some snooping around the forums and found a few options but I haven't seen my exact scenario. The old steel trap is soldered in and only about 2" of the drain pipe is exposed. How far in should I cut the drain pipe so that I get the whole trap out? I understand normal bathroom drains are 1 1/4" so should I just get a PVC trap and then a Fernco adapter or is there a better option?

Thanks for all your help.

 
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Old 06-21-17, 04:33 PM
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Actually you can get Fernco 1" to 1" coupling and insert the P-trap directly into the Fernco.
How far in should I cut the drain pipe so that I get the whole trap out?
Post a picture please. http://www.doityourself.com/forum/li...rt-images.html
 
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Old 06-21-17, 05:51 PM
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Thanks for the reply. I'll go to the plumbing store and see if I can find one. Here is the current state of the project.
 

Last edited by chi2fw; 06-21-17 at 06:37 PM.
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Old 06-21-17, 06:08 PM
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Tiny Pic doesn't work here. Please insert your image as instructed in my first post.
 
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Old 06-21-17, 07:43 PM
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The picture should work now
 
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Old 06-21-17, 08:32 PM
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Old 06-22-17, 06:24 AM
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Great. Thanks for the visual. What material should the trap be? Does it really matter?
 
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Old 06-22-17, 11:58 AM
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I like PVC. The brass traps eventually deteriorates. Use the slip joint ones. They are a lot easier then the glue-ups.
 
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Old 06-22-17, 12:21 PM
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Here's a link to the Fernco coupler you need if the pipe is 1.5" copper:

1-1/2 in. EPDM Rubber Shielded Coupling-P3001-150 - The Home Depot

This adapter will clamp tightly to the copper and allow you to use the other end for a plastic male 1-1/2" trap adapter or a street elbow. From there you can use slip fittings as suggested.

Copper and ABS/CI/PVC have slightly different O.D.'s and a regular 1.5" no-hub will not work.
 
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Old 07-06-17, 02:09 PM
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So, the granite countertop is being installed tomorrow and I am working on the drain. I used a hacksaw to cut the pipe at the suggested area and didn't get a completely straight cut. Does that matter with a Fernco coupling? Secondly, I was off on the size of the copper pipe. It is 1 1/4" so I bought a Fernco P1056-125 which is 1 1/4" x 1 1/4" adapter. However, I didn't fit the parts in the store and there is a 1/2" gap. Am I supposed to just tighten that way down or did I buy the wrong part?
 

Last edited by chi2fw; 07-06-17 at 02:40 PM.
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Old 07-06-17, 05:47 PM
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didn't get a completely straight cut. Does that matter with a Fernco coupling?didn't get a completely straight cut. Does that matter with a Fernco coupling?
No as long as square enough to have at least an inch all the way around so the clamp grips metal underneath firmly at all points when you tighten.
 
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