P-trap arm insertion depth


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Old 04-01-16, 11:15 AM
Z
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P-trap arm insertion depth

hi folks Ė

I canít post a picture because the camera battery is dead.

I have to replace the sink plumbing in a bathroom. The stuff is really old falling apart (in my hand). The drain stub-out coming out of the wall I believe is brass. I cleaned out the old metal pieces of the trap arm from inside the stub-out where it had broken off. Got it all out.

The piping is 1 ľ and just for a test I tried an old PVC 1 ľ trap arm I had laying around with a nut and washer and fastened the PVC trap arm into the stub-out.

But hereís the thing. Inside the stub-out there looks to be a stop about 1 inch down the pipe. So after you push the pipe as far as it will go (one inch) into the stub-out, and then put the nut and washer on, you are only holding onto about an 1 ľ of the trap arm. But it seems to be pretty tight.

The stop inside the stub-out looks like a machined ridge where I guess the pipe actually gets a little smaller at that point. It seems to only go about 1/3 of the way around the inside of the pipe, because, I believe, there is a lot of corrosion inside the pipe and so the stop has been corroded the other 2/3 of the way around the pipe.

Thatís the way it looks to me anyway. I cleaned the stub-out out the best I could and the ridge Iím talking about certainly looks machined Ė not some kind of buildup.

My question is: does it make any sense that there would be a stop such that you can only push a pipe inside to a depth of an inch?

Any thoughts would be greatly appreciated!
 
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Old 04-01-16, 11:24 AM
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You're fine. Personally I don't like the trap adapters with stops, it makes measuring harder.
That said, I wouldn't change the adapter, just measure so the trap arm is fully seated.

If any leaks develop at the adapter connection, it won't be because there's only 1" inserted. So check for leaks and post back for remedies.
 
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Old 04-01-16, 12:16 PM
Z
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Thanks a lot Brian. It never occurred to me about making the measuring harder. But I see exactly what you mean.

Iíll post back when I put it together and check for leaks (I have 2 speeds: slow and stop, lol)

Thanks again!
 
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Old 04-04-16, 03:12 PM
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Brian -

You were correct. No problem. A little hard to measure as you said - but no leaks! Hot dog and yeeehaaa!!!!
 
 

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