Re plumbing drain line for sink

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  #1  
Old 05-20-17, 07:29 PM
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Re plumbing drain line for sink

I replaced a on the counter bowl type sink with an under mounted sink. So the drain is too high to accommodate the new setup.

See attached pictures... It looks like I need to lower the whole drain about 2.5"-3" to make it work (is that right?). I would imagine cutting the left side where the drain comes out of the wall and just creating a whole new drain. I can visualize it in my head but I don't know the fittings to use.

Please see pictures and help me get started on this... thank you!!
 
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Old 05-20-17, 07:44 PM
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You may need to use a new trap with a full length trap arm and/or an extension.
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Last edited by ray2047; 05-20-17 at 08:47 PM.
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Old 05-20-17, 09:36 PM
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Thanks for the reply and taking the time to edit my photo. Makes sense now. So the trap arm will come right out of the pipe that goes in to the wall? In that picture at the very bottom of your post is that a "trap arm extension"... trying to figure out what that is called. Also how is the slope of the trap arm created?

It's been a while since I've done PVC work, if you can't tell!!!
Thanks again.
 
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Old 05-20-17, 10:32 PM
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the trap arm will come right out of the pipe that goes in to the wall?
Yes.
is that a "trap arm extension"
No just an extension tube. It has multiple uses anywhere you need to extend drain tubing.
Also how is the slope of the trap arm created
Level is normal otherwise it might not seal at the joint.
 
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Old 05-21-17, 09:50 AM
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Is this the right part to extend the arm of the p-trap?

https://www.lowes.com/pd/Keeney-1-1-...upling/1071635
 
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Old 05-21-17, 10:44 AM
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Is this the right part
Yes, if this is a lavatory sink with 1" drain.
 
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Old 05-22-17, 02:11 PM
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Well I got the one done. Of course I forgot to snap pictures but I will when I get a chance. But it worked out pretty good, put a new elbow out of the wall. I bought a 60 degree and a 45 degree. Of course I needed a 22.5 degree so back to the store I went. Now for the other side (this is two sink bathroom).

This other side might be a little tougher. There is no room at the wall to cut the elbow coming out. Also, where you see the black drain tube in the pictures, it's not all the way down. It's hitting the trap. Height wise, this setup looks good. Might not even need an extension going out of the top because there is still a good inch or two it needs to come down. But how can I rotate the whole trap assembly to get it out of the way of the drain?

Where the pipe comes out horizontally, put an elbow in there then run some 1.5" then put another elbow in to "swing it back" toward the drain pipe? I'm talking about doing a 90 degree elbow then a 180 degree which I am guessing would be two 90's. It would be pretty convoluted.

See pics... care to take a stab at this one?! Some of the pictures I took before putting the counter top back on.

Thanks again.
 
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Old 05-22-17, 06:26 PM
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Cut off the trap adapter and glue a 45 on that piece of pipe. Dry fit it all with a new trap adapter. May need to go left or right with 45... Try it..
 
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Old 05-22-17, 09:50 PM
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I agree with Mike NJ.
If you cut off the existing trap adapter you can glue on a 45 street elbow and then glue on the same type of female trap adapter you have now to the street end of the elbow.

It looks like if you point the street elbow to the right you will be able to align the pipes by a combination of shortening the trap wall arm and swiveling the trap into position.

You are in luck because you have enough pipe coming out of the tee to attach another fitting.
 
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Old 05-23-17, 08:32 AM
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But where is the vent? If that pipe going into the wall just goes to the other sink how is it vented? Sure looks like an S trap modified to P trap with no vent.
 
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Old 05-23-17, 10:50 PM
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Isn't the top part of that the vent? What else would it be?
 
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Old 05-24-17, 12:38 AM
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sn't the top part of that the vent? What else would it be?
I don't know. It could just go to a sink on the other side. That is why I asked. Unusual for a drain to come up outside of the wall then go to a vent inside the wall.
 
 

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