Dumb sink plumbing/P trap question

[TT_Vert]

My sister put in a single drain sink. I put in a p trap for now but the bottom fitting is currently a slip fit which has very little material to allow sealing and isn't the right way to do it. I need slip fit into the disposal and into the home drain pipe and threaded coupling at the bottom there. When I was at home depot all I found was slip fit for this application down there unless the pipe going up towards the sink drain was threaded. Most of what I found does not go down far enough, as you can see, that acordian piece is fully compressed I was unable to find a slip fit out of the disposal to a threaded coupling at the P trap and then slip fit into plumbing. Am I missing these? I figured these would be super easy to find but even the HD guys said they didn't have this.

The pic w/ a tape measure shows a normal P trap and that even if I cut the black discharge elbow of the disposal shorter it wouldn't work. It was about 2" high from where it needs to be.

Thanks
Dave

 

[The Cobbler]

you have way to deep of a trap there, and will be prone to plugging . cut the leg of the disposal unit tighter to the bend and raise the entire trap up higher . even then you're really too close but it's better than what you have. or loose the 90 on the disposal altogether

or

 

[TT_Vert]

you have way to deep of a trap there, and will be prone to plugging . cut the leg of the disposal unit tighter to the bend and raise the entire trap up higher . even then you're really too close but it's better than what you have. or loose the 90 on the disposal altogether

or

Even if i were to cut that black elbow as far up as I can, it's still too high. She now has a single basin sink which is why we're where we are now. If I were to run a straight tailpiece out of the disposal instead of the elbow, how would that help with the disposal as close to the drain pipe as it is? Maybe a straight tailpiece right to a slip 90 like this? I can then use a tailpiece out of that to the P trap possibly.

 

[PCustoms]

Step 1: get rid of that accordion BS

Step 2: what size pipe?

Step 3: that might be creating a "s" trap, are there any other fittings to mount to the disposal?

Step 4: that is a test plug. Either plug that properly of better yet cut it back.

Generally I try to stay away from the **** in the faucet aisle, might be better off with actual fittings from the pipe section. I'm not really seeing the issue, other then less then optimal fitting selection

 

[TT_Vert]

Step 1: get rid of that accordion BS

Step 2: what size pipe?

Step 3: that might be creating a "s" trap, are there any other fittings to mount to the disposal?

Step 4: that is a test plug. Either plug that properly of better yet cut it back.

Generally I try to stay away from the **** in the faucet aisle, might be better off with actual fittings from the pipe section. I'm not really seeing the issue, other then less then optimal fitting selection

I'd love to get rid of the acordion but there is a slight offset I need it for if i recall. I'll have to double check. 1.5" pipe. No other fittings on the disposal. The issue is that bottom right connection (marked as needs to be threaded) is a slip fit and that p trap is not designed for a slip fit so it'll easily leak if that pipe is moved. In essence, it's slipped in maybe 1/2" if that and not a reliable connection.
How would you plumb that using PVC fittings instead? Will those slip fit tail pieces work w/ PVC fittings? IE, is the OD of those slip fits the same as the ID of PVC elbows, etc? If so, that'd be easy w/ just cutting/gluing pvc, ect.|
If not, how would I connect to the garbage disposal?

Dave

 

[gagecalman]

It looks like the disposal outlet is almost the same height as the drain so it's too low for it to work properly.
Very common issue when people install a deeper sink or install a disposal.

Did she put in a deeper sink or replace the strainer with the disposal?

If you look at your second picture you can see where the outlet needs to be.

Either remove the disposal or open the wall and lower the drain.

 

[PCustoms]

I strongly prefer the glue in place, full thickness PVC traps:

I'd love to get rid of the acordion but there is a slight offset I need it for if i recall. I'll have to double check. 1.5" pipe.

If you use the fittings above you can usually clock them at the threaded portion to account for alignment.

The issue is that bottom right connection (marked as needs to be threaded) is a slip fit and that p trap is not designed for a slip fit so it'll easily leak if that pipe is moved.

The issue is you're using cheap trap parts wrong.

That will clock and/leak the way you're doing it.

 

[PCustoms]

It looks like the disposal outlet is almost the same height as the drain so it's too low for it to work properly.
Very common issue when people install a deeper sink or install a disposal.

This as well as what I posted.

One of the reasons I prefer the drain through the cabinet bottom. The other is I try to keep plumbing out of exterior walls up here.

 

[Bert_]

Do it with PVC or abs instead of the tubular plastic. You might have a slightly deeper trap but not bad. Better than cutting open the wall to lower the whole thing.

 

[cgrutt]

Can you lose the Y connector and go right back to wall with a P-trap? Sorry for chicken scratch but lose the red and replace with green. May need to turn disposal to get things to line up.

 

[PCustoms]

Can you lose the Y connector and go right back to wall with a P-trap? Sorry for chicken scratch but lose the red and replace with green. May need to turn disposal to get things to line up.

If he grabs the fittings I showed earlier and cuts that black piece coming out of the disposal this may work.

Disclaimer: this still may be an S trap

 

[T444e]

If there is a vent in the wall, most likely, it's not an S-trap

 

[TT_Vert]

Thanks for the help guys. Ended up using a few 90 deg slip joints and tail pieces with a P trap I found which was threaded on both sides. The drain is about 3/4" higher at the disposal than the wall entry so I assume draining should be fine (and it has been for her thus far). Not idea, but functional. Got rid of that accordion piece as well.

 

[Sturgeon]

Home owner pipe runners were always a good source of income. Look to youtube and take it with a grain of sale.

 

[TT_Vert]

Home owner pipe runners were always a good source of income. Look to youtube and take it with a grain of sale.

Not sure what that that means but ok..

 

[cpakalolo]

This as well as what I posted.

One of the reasons I prefer the drain through the cabinet bottom. The other is I try to keep plumbing out of exterior walls up here.

We can't do S traps anymore.

 

[PCustoms]

We can't do S traps anymore.

Pretty sure most places have "banned" them.

But what does it have to do with my post?

 

[Junkman]

We can't do S traps anymore.

 

[Bert_]

Thanks for the help guys. Ended up using a few 90 deg slip joints and tail pieces with a P trap I found which was threaded on both sides. The drain is about 3/4" higher at the disposal than the wall entry so I assume draining should be fine (and it has been for her thus far). Not idea, but functional. Got rid of that accordion piece as well.

That deep of trap isn't great. At least it's slip joint so you can take it apart to clean

 

[mike93lx]

Would have been much easier to do and far more reliable in the long run without that garbage disposal in there.

 

[gahrajmahal]

Sometimes when I have a particularly annoying plumbing problem I take photos and measurements. Then in your case I’d take the complete existing drain setup to the pro plumbing only store. I’d then have a discussion with them. Often, the plumbers waiting on parts and multiple counter men will get involved in the solution. They then go to the back and get all the correct parts and charge what usually is 20% to 50% more than you spent for your original contraption, but you get something that actually works.