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Old 08-03-2017, 07:50 AM   #16
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I got a 1.25" trap and it got a nicely. I had to get an extended for the tailpiece to get it to fit. How does the 1.25" pipe for the trap connect to the 2" wall drain? I can get a reducer and glue it to the end of the wall pipe, and then just push the 1.25" thru the wall. Does that piece need to be hlued?
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Old 08-03-2017, 08:12 AM   #17
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Re: No Room For Trap Under Vanity


You need something like this to fit outside the pipe in the wall and will fit the trap.
The join to the pipe is glued and the threaded end is not.
http://www.homedepot.com/p/1-1-2-in-...-100348180-_-N
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Old 08-03-2017, 10:04 AM   #18
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Re: No Room For Trap Under Vanity


Quote:
So I have a horizontal pipe with an elbow to get the stub out of the wall. Do i just want to cut that elbow and attach a new one turned clockwise 90 degrees so that it then goes up? Add 3 or 4" of 2" from that elbow going up, and then another elbow to pop out of the wall higher?
No, you cannot do that. That would amount to an "S" trap. The drain cannot turn down before it reaches a vent.
Proper corrective procedure would be to cut out drywall above the existing drain. You would then see how the vent is plumbed in. Vent should go up above the sink level before it turns horizontal.

Cut drywall around and above the drain and between the supply valves. Cut drain and vent pipes. Using a coupling, glue in enough PVC pipe to the drain line to get to the level you need, put in sanitary tee, cut and reconnect the vent pipe to top of sanitary tee.

If you do not have enough flexibility in the vent pipe (can't raise it up enough to get it in the top of the tee), glue in a short piece of PVC into top of tee then connect to vent pipe with shielded rubber coupling.

Should be fairly easy to do. You have PVC pipe and the cabinet will hide the drywall patch. You only need to seal the wall, you don't have to make it pretty.
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Last edited by hkstroud; 08-03-2017 at 10:07 AM.
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Old 08-03-2017, 11:28 AM   #19
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Hkstroud thanks for that detail. If the 1.25" trap fits, any issues just going that route and not tearing the wall apart?
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Old 08-03-2017, 11:33 AM   #20
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Re: No Room For Trap Under Vanity


Not a plumber but have done lots of plumbing work. Do you have emough room to usr a pvc 90 on the stub, then a short vertical pvc pipe, then another pvc 90 then a short piece of pvc pipe and finally a 1 1/4" trap adapter. Then a tubular pvc trap should work. I am not sure what size pvc stub you have.

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Old 08-03-2017, 11:39 AM   #21
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Re: No Room For Trap Under Vanity


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Originally Posted by jeffmattero76 View Post
Not a plumber but have done lots of plumbing work. Do you have emough room to usr a pvc 90 on the stub, then a short vertical pvc pipe, then another pvc 90 then a short piece of pvc pipe and finally a 1 1/4" trap adapter. Then a tubular pvc trap should work. I am not sure what size pvc stub you have.

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you don't want a vertical before the vent.
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Old 08-03-2017, 11:40 AM   #22
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The stub is a 2" pipe and I don't have room to use 2" PVC to build the trap. The only way I can fit without any modification to wall or vanity is by using 1.25" directly from the 2" stub.
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Old 08-03-2017, 11:49 AM   #23
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Re: No Room For Trap Under Vanity


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Originally Posted by JBG420 View Post
The stub is a 2" pipe and I don't have room to use 2" PVC to build the trap. The only way I can fit without any modification to wall or vanity is by using 1.25" directly from the 2" stub.
Is the outside diameter 2.5" or 2"?

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Old 08-03-2017, 12:52 PM   #24
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OD is 2".
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Old 08-03-2017, 02:29 PM   #25
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Re: No Room For Trap Under Vanity


Quote:
OD is 2".
That is 1 1/2" pipe. Pipe is measured on the inside, tubing is measured on the outside.

A kitchen sink has a 1 1/2" trap. A bath lavatory has a 1 1/4" trap, can be 1 1/2".

If a 1 1/4" trap will work put a trap adapter on stub out of the wall and use the 1 1/4" nylon compression ring.
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Old 08-03-2017, 03:46 PM   #26
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Re: No Room For Trap Under Vanity


Pipe in the picture is 1 1/2". If the 1 1/4" trap works with the drain pipe you already have, just use it as is.

Posts like this should serve as a reminder to everyone remodeling. Know what fixtures you are going to use and plan and install the plumbing accordingly prior to closing the walls.
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Last edited by SHR Plumber; 08-03-2017 at 03:49 PM.
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Old 08-03-2017, 06:09 PM   #27
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Re: No Room For Trap Under Vanity


This will glue into a 1-1/2" sanitary T or elbow on one end and accept a 1-1/4 P trap on the other.


https://www.lowes.com/pd/Charlotte-P...itting/3339768
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Old 08-03-2017, 06:17 PM   #28
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Perfect. Thanks for all the help guys.
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Old 08-03-2017, 07:06 PM   #29
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Re: No Room For Trap Under Vanity


How about 1.5" adapter, buy a nut and a 1.25" washer?

"amount to a S trap"
Does OP's short drop matter? S traps usually go through the floor so the long drops are bad. It does feel like set up for more blockage.

Last edited by carpdad; 08-03-2017 at 07:12 PM.
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Old 08-03-2017, 07:15 PM   #30
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Honestly, wouldn't be the first s trap in this house if i went that route. Not as big an issue when known about and used correctly but I understand why they are a no-go for the masses.
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