Double sink to single sink drain

[Matt_Towery]

Good evening. In the middle of a kitchen remodel and I have went from a double bowl sink to a single bowl. Disposal flange and garage disposal are currently hooked up and is draining. My question is how would you hook up this connection? The way I have it hooked up now is a place holder for the time being. Please see pictures below.

 

[Reach4]

What is the altitude difference between the 1.5 inch OD black pipe out of the disposal and the 1.5 inch pipe going into the fitting at the wall? i.e., which is higher, and by how much?

Use a level. A laser level is nice, but a bubble level will do the job.

 

[Sponsor]

 

[Matt_Towery]

What is the altitude difference between the 1.5 inch OD black pipe out of the disposal and the 1.5 inch pipe going into the fitting at the wall? i.e., which is higher, and by how much?

Use a level. A laser level is nice, but a bubble level will do the job.

1.5 fitting in the wall sits a tad higher.

 

[Reach4]

You need to get a shallower sink, or get the wall opened and a lower drain connection put in.

 

[Matt_Towery]

You need to get a shallower sink, or get the wall opened and a lower drain connection put in.

Yikes. That is what I was afraid of. What are the disadvantages of the wall drain sitting higher than the disposal drain? Is lowering the drain in the wall my only option?

 

[Reach4]

Yikes. That is what I was afraid of. What are the disadvantages of the wall drain sitting higher than the disposal drain? Is lowering the drain in the wall my only option?

What is the dimension from the bottom of the sink to the middle of the disposal outlet? 6-11/16 inches maybe?

 

[Matt_Towery]

What is the dimension from the bottom of the sink to the middle of the disposal outlet? 6-11/16 inches maybe?

Bottom of sink to center of disposal outlet is 6 inches.

 

[Reach4]

Bottom of sink to center of disposal outlet is 6 inches.

So you probably have a Compact or a Space Saver.

I wish I could tell you there is a special mount that would raise your disposal 3/8 inch. Sounds like a useful product, but I don't know of anybody offering it.

So change sinks? The deep undermount sinks can be a problem.

Maybe somebody will tell you that having water standing in the bottom of your disposal is not so bad. I am not a plumber.

 

[Matt_Towery]

So you probably have a Compact or a Space Saver.

I wish I could tell you there is a special mount that would raise your disposal 3/8 inch. Sounds like a useful product, but I don't know of anybody offering it.

So change sinks? The deep undermount sinks can be a problem.

Maybe somebody will tell you that having water standing in the bottom of your disposal is not so bad. I am not a plumber.

Appreciate your insight. You would think there is something out there. The garbage disposal will be deleted before I open up the contrete block to lower the drain.

 

[Reach4]

Appreciate your insight. You would think there is something out there. The garbage disposal will be deleted before I open up the contrete block to lower the drain.

On a slab I presume.

Yeah, not having a disposal is not that big of a deal IMO. Opinions vary.

 

[Matt_Towery]

On a slab I presume.

Yeah, not having a disposal is not that big of a deal IMO. Opinions vary.

Correct. On a slab. A sink strainer will do but the wife my not like it. Plus more space under the sink.

 

[Matt_Towery]

Pulled this from an old thread. Wonder if this will work.

 

[Jeff H Young]

too bad about losing the disposal but at least probem is solved

 

[Matt_Towery]

Trying to figure out all my options. Seems the reversing P trap will do, but the pic below was also from this forum. Thoughts?

 

[Jeff H Young]

since lowering waste is not an option I wouldnt have standing water in my disposal but no matter what you do your going to have the same set up you do now . It will look cleaner with trap reversed . And look cleaner and function better with disposal removed.

 

[Matt_Towery]

since lowering waste is not an option I wouldnt have standing water in my disposal but no matter what you do your going to have the same set up you do now . It will look cleaner with trap reversed . And look cleaner and function better with disposal removed.

Thanks Jeff. Is there a setup that will rid of the accordion p trap? Thinking more of a straight pipe coming out of the disposer.

 

[Jeff H Young]

yes Matt might need to put a 45 on trap arm garbage disposal turns as well and use trap like terry showed . but i think disposal will be short lived.

 

[Reach4]

Is there a setup that will rid of the accordion p trap? Thinking more of a straight pipe coming out of the disposer.

The output pipe is called a "discharge tube" Some are straight, and that may help your cause.
You can also cut your curved discharge tube shorter, so that might work as well as using a straight tube.

You are thinking about having those joints under pressure; that is done a lot and is OK. Don't cut so much as to get the gasket into the curved area of the discharge tube. Don't use tape or dope on the connections, but some thicker silicone grease might be a good idea to get the gasket to seat better.

Some people like to put ice cubes down the disposal to help clean food away.

 

[Matt_Towery]

Jeff - trying to picture the 45 as the discharge pipe turns out of the disposer to connect to the reverse p trap.

Reach - Thanks for sticking this one out as this is a learning process. If I ended up going with a straight discharge tube would you cut the drain coming out of the wall back a little to get some distance on the tube coming out of the disposer? Envisioning a straight pipe with a threaded 90 to the reverse p trap.

 

[Reach4]

If I ended up going with a straight discharge tube would you cut the drain coming out of the wall back a little to get some distance on the tube coming out of the disposer?

Cutting that pipe, and gluing a new trap adapter close to the wall would give flexibility. Also, you can rotate the disposal to put the output orientation the way you want.

I am not sure that a straight discharge tube would help.

You could cut a double offset tube to get a 45 that you could stick into the trap adapter, to give the 45 that Jeff suggested.