Need Some Help Rerouting Existing Plumbing

[Quarterwave]

Hi everyone,

I have a small, dripping leak from a pipe under my kitchen sink. It was botched by the previous owner and so now, I'm trying to resolve it.

Plumbing 1

• Quarterwave
• Oct 28, 2019

When I use a tape measure, the white pipe in the red circle is a little over 7 and a half inches in circumference. If I use PIE that works out to be around 2 1/2 inches - however, when I compare the pipes at Home Depot, the 3 inch pipe looks more like it.

What I "think" I'll do is cut where the red circle is so that I have a somewhat nice piece of pipe as the leak is coming from where all that silicone is.

However, I have two lines running into it - one from a sink and one from a disposal. Here's a pic of the lines running into that Y pipe:

Plumbing 2

• Quarterwave
• Oct 28, 2019

My question is - what is the neatest/cleanest way to run these pipes?

I had a hard time at Home Depot this weekend finding a 3" pipe with two, 1.5" outlets - does that even exist?

Any informed opinions are much appreciated!

 

[Diehard]

A 2 in. PVC Pipe(not the fitting hub) has an outside dia of 2.375 in., which is what that pipe is.

I'll let an experienced plumber suggest how they think can best be done.

If you're saying it's leaking from that wye joint(arrow pointing at it), you'd have to replace quite a bit OR try to ream out and reuse that wye. Keeping in mind that the pipe length inside that 2"fitting is 1-3/8". If that's a coupling to the right and you have at least 1-3/8" from it's right edge to the cabinet, you could cut it out(at the right edge and replace with a new one with a new piece of pipe that will reach the inside of that wye ftg.(or the wye fittings replacement along with that entire fitting bound assembly of piping all the way from the traps, I believe.) You at least have those 2 screwed connections at the traps which will allow you to remove it allow you to make up those new joints.

Let's hear what the plumbers recommend.

 

[Jeff Handy]

Looks like two totally failed solvent weld AKA “glue joints” right inside your circle.

If you chip away at that blob of polyurethane filler over on the right, you might free up the pipes enough to get some play, to be able to pull things apart and repair easier.

Or just temporarily take off both P traps to the left, so you have play in the pipes to pull that failed stuff apart, you might be able to clean up the surfaces with sandpaper, then try re-gluing after vigorous cleaning with purple primer.

You might need about an inch longer stub of pipe, because both those failed joints have backed way out, and the old pipe stub will now be too short once it gets properly seated all the way into both solvent joints.

 

[frodo]

If it was my sink, cut where indicated
toss that other out.
install a street 45 on the pipe you just cut.

then buy the parts below


1]]]https://www.lowes.com/pd/Keeney-1-1...8&gclid=CIfm8YG_weUCFQjDgQodVOMHIA&gclsrc=ds#

1]]]https://www.lowes.com/pd/Keeney-1-1...8&gclid=CIfm8YG_weUCFQjDgQodVOMHIA&gclsrc=ds#

2]]]https://www.lowes.com/pd/Keeney-1-1-2-in-Plastic-Sink-Tailpiece/1070101

2]] https://www.lowes.com/pd/Keeney-Plastic-Slip-Joint-Washer/1070381

 

[Quarterwave]

Thank you everyone.

Do I still need a p-trap for the sink and also the disposal?

Frodo - from your explanation, I would run the 1-1/2-in Plastic Slip Joint End Outlet from the sink to one side of the 1.5" wye, and use the 2" adapter to shrink the 2" outlet/inlet from the wye into another 1-1/2-in plastic slip joint form the disposal - correct?

View attachment 22350

If it was my sink, cut where indicated
toss that other out.
install a street 45 on the pipe you just cut.

then buy the parts below

View attachment 22351
1]]]https://www.lowes.com/pd/Keeney-1-1...8&gclid=CIfm8YG_weUCFQjDgQodVOMHIA&gclsrc=ds#

1]]]https://www.lowes.com/pd/Keeney-1-1...8&gclid=CIfm8YG_weUCFQjDgQodVOMHIA&gclsrc=ds#

2]]]https://www.lowes.com/pd/Keeney-1-1-2-in-Plastic-Sink-Tailpiece/1070101

2]] https://www.lowes.com/pd/Keeney-Plastic-Slip-Joint-Washer/1070381

 

[Diehard]

Thank you everyone.

Do I still need a p-trap for the sink and also the disposal?

Frodo - from your explanation, I would run the 1-1/2-in Plastic Slip Joint End Outlet from the sink to one side of the 1.5" wye, and use the 2" adapter to shrink the 2" outlet/inlet from the wye into another 1-1/2-in plastic slip joint form the disposal - correct?

I figured you may have a problem with what frodo was suggesting. Based on his links to the piping assembly and a cleanout at the wye, pretty sure he was suggesting one trap.


You may want to double check that you will have sufficient height to do this, because it looks like it may drop your existing trap height and the other end may not be low enough.

Also, I'm not sure but where he calls starting with a 2" street 45 I think he may have been thinking the spigot end would connect to a new wye. However, I think you may need a short piece of pipe between the 45 and the wye to get the piping aligned with the trap.

Looks like what he has suggested is an improved arrangement and gets that clean out in a more accessible location.

He may have been thinking a double sink. So don't know how a disposal will fit the mix.

 

[Quarterwave]

Thanks Diehard. There are two sinks - the one on the left is a regular sink, while the one of the right has a disposal unit. Each has it's own piping to the combined pipe that runs out of the cabinet wall on the right hand side. I'm just not sure if there is enough depth to run the piping as recommended due to the disposal.

I figured you may have a problem with what frodo was suggesting. Based on his links to the piping assembly and a cleanout at the wye, pretty sure he was suggesting one trap.

View attachment 22359
You may want to double check that you will have sufficient height to do this, because it looks like it may drop your existing trap height and the other end may not be low enough.

Also, I'm not sure but where he calls starting with a 2" street 45 I think he may have been thinking the spigot end would connect to a new wye. However, I think you may need a short piece of pipe between the 45 and the wye to get the piping aligned with the trap.

Looks like what he has suggested is an improved arrangement and gets that clean out in a more accessible location.

He may have been thinking a double sink. So don't know how a disposal will fit the mix.

 

[Diehard]

Yes, that's what I figured. Just for the heck of it, would be nice to see the connections at the disposal and sink.

The fact that everything appears to be glued makes it tough to take apart and replace just a portion. In particular, that wye fitting which has the leak must have that joint redone somehow, as mentioned. Refer back to comments #2 and #3.

 

[TomFOhio]

They do make a disposal kit. It comes out of the side of the disposal and into the tee of the other sink.

 

[Quarterwave]

Thanks Tom - I was at Home Depot over the weekend and picked up a bunch of pieces for the job, which I'm planning on tackling this weekend.

They do make a disposal kit. It comes out of the side of the disposal and into the tee of the other sink.

 

[Quarterwave]

Yeah, I agree. When I looked at how it had just been slapped together, I wonder why someone would bother not fixing it correctly. It's tight near the wall, and I'll have to see if my pipe shears will get in that close. If they do, I'll put on the 45 degree elbow that you recommended, run a length of 2" pipe and then a 1.5" reducer.

For the sink, I'm planning on running it across to the disposal outlet pipe as I "think" there might be enough room if I keep things tight. From there, I'll run the 1.5" from the disposal (with the sink plumbed into the down pipe before the P-trap), then run that to the 1.5" reducer...

Yes, that's what I figured. Just for the heck of it, would be nice to see the connections at the disposal and sink.

The fact that everything appears to be glued makes it tough to take apart and replace just a portion. In particular, that wye fitting which has the leak must have that joint redone somehow, as mentioned. Refer back to comments #2 and #3.