Trap Adapter Seems too small for P Trap


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Old 08-03-18, 07:40 AM
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Trap Adapter Seems too small for P Trap

Hello everyone,

My contractor recently installed 2 drain lines for a double vanity we are installing in our master bathroom renovation.

Now that I am on the step of hooking up the p trap to the sink, I am running into an issue.

It looks like he installed 2 different trap adapters, the one on the left of the pictures is the one he has used before and it works fine. The p trap slides into it and then is attached using the washer and the nut. (as you can see from the other picture)

The one on the right seems smaller and the p trap will not slide in. The washer is built into the nut.

I called the company that makes these trap adapters and they said that the smaller one is used for what they called "tube size" pipes. Does anyone know what they mean by this? I called the plumbing dept at HD and they had no idea what that was.

The p trap is a standard 1.25 for a bathroom.

Is there any kind of p trap that would work with this smaller trap adapter? Or am I going to have to figure out a way to cut it out and install the correct one?

If anyone can provide any insight, I would appreciate it.

Thanks.
 
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Old 08-03-18, 07:46 AM
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Vanity sinks are 1". Just use an 1" trap. the other trap is 1" which is okay.
 
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Old 08-03-18, 07:52 AM
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I am using a 1 1/4 trap. It is too big to slide into the the trap adapter nut.
 
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Old 08-03-18, 10:19 AM
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I think tube size means the pipe nominal size (1 1/4 in this case) refers to the O.D. measurement. So 11/4 tube size would have an actual O.D. of 1 1/4“.

But for pipe sizes (and PVC comes in pipe sizes), the nominal size 1 1/4” has an O.D of 1.66”.

But I don’t know much other than that and I didn’t know tube sizes were used in bathrooms. (Or maybe it shouldn’t have been. Hope not!)

(Forgot to mention - I've never actually seen PVC tubing, but I could believe it exists. Maybe the experts will weigh in)
 

Last edited by zoesdad; 08-03-18 at 10:39 AM. Reason: added "Forgot...
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Old 08-03-18, 01:31 PM
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Sorry! In last post I meant I never saw PVC tubes - like 1 1/4 tubes etc. There is a lot of PVC tubing.

Couldn't you measure the O.D. of the pipe coming out of the wall and see if there is anything funny about that pipe?
 
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Old 08-03-18, 02:19 PM
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The label on the left says for 1-1/2 and 1-1/4 traps. What does the right label say ?
 
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Old 08-04-18, 01:09 PM
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I am using a 1 1/4 trap. It is too big to slide into the the trap adapter nut.

Are you sure? The PVC traps I have installed are all 1 1/2" and come with both 1 1/4" and 1 1/2" nuts/washers so they can be used on either a kitchen 1 1/2" tailpiece or a bathroom 1 1/4" tailpiece. My guess is that a true 1 1/4" trap, such as a chromed brass 1 1/4" trap, will fit the adapter on the right perfectly.
 
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Old 08-05-18, 10:01 AM
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Old 08-05-18, 12:14 PM
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He is writing the adapter is too small so it isn't a reducer he needs.

I'm wondering if the alleged 1" trasp is really 1". Take the ring to a real hardware store and ask for a trap that fits.
 
 

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