Hi Kathy, I remember responding to one of your previous posts regarding the Performa sink. I have the 1-3/4 sink with an Insinkerator Evolution Essential Pro installed under the smaller bowl. This model is not the compact version. It is crowded under my sink but I also have a trash pullout there too. The plumber who did the work did not have any issues getting it to fit. I was there the day of the install and he didn't complain about anything. The garbage disposal works fine. The sinks drain fine and the dishwasher gets the dishes clean as a whistle.
My sink is located in an island but regardless the drain has to be the right height in the cabinet just as it would have to be if it exited out the back of a cabinet and into wall.
From the middle of the disposal opening to the cabinet floor is 12 inches by my quick measuring. From the middle of the exit drain to the cabinet floor is approx. 10 inches. So while it doesn't look lower in the pictures it is.
The exit drain could be lowered but since you cabinet and counter tops are already in place I am sure it would be problematic. I know that we had to open wall and lower exit drains in a bathroom remodel.
Here are a couple pictures. Hope you can tell how the two sink drains are connected. You can email me if you would like me to send some additional photos.
Hope you can get it too work out.
{{!gwi}}

{{!gwi}}

{{!gwi}}

The only thing that a plumber friend of ours commented on about the installation was that the drains on the two sinks should have been metal not plastic. He said that the plastic ones tend to develop leaks after a few years. I am not going to lose sleep worrying about a possible future leak.

I ordered a Diamond super single bowl undermount sink for our kitchen. This has me a little concerned that my new disposal won't be higher than the drain out the back of the cabinet too because the sink is deeper than my current topmount. Is there a disposal that has an outlet higher than normal? Or is the solution that the plumber has to move the drain lower in the wall? Is that a huge project for them to move it?

Thanks badgergal!! I was looking at the post someone else started about this issue and you had posted a photo, but these extra photos really help.

You are right, it would have been much easier to move the exit drain before the sink was installed. Arghhh. My DH has evaluated it (and he is a very good handyman) and he believes the only solution is to lower the exit pipe. That will involve cutting the back of the sinkbase and the drywall behind. Not a fun or easy thing--sure wish the GC had figured this out before we installed cabinets.

Psuedochef--make sure your GC or plumber knows how deep your sink is and how big the disposal is. When in doubt--lower the pipe! We have looked at other disposals and there are a few that are slightly shorter, but not by much. If you need to move the drain the time to do it is after you tear out the old cabinets and before the new ones are installed.

Thanks to all of you for the great info! I am getting ready to order the same performa and I don't want to have to buy a new disposal. I think I will show this thread to the GC before I order! Once again GW comes through.

Sorry to hear that you have to do some rearranging of the pipes but at least they didn't just go ahead and connect it the too high exit drain and then pretend all was well.
Hope things proceed smoothly from here on.
I will be watching for your reveal.

I'm going through the same thing right now, with this same sink. My drain pipe exits at the wall at 17.5". I bought the Evolution Excel and it requires 4 more inches to where the pipe hits the disposal, then another 6.7" to the top of the disposal. With ~10" more for the depth of the sink, it's already too high.

The other Evolutions (including the Compact) and the Waste King don't have any less stringent height requirements.

This is an important thing to check for anyone getting a deep sink. Luckily I caught this before the cabinets went in.

It's a false economy to keep the same garbage disposal when redoing a kitchen. First of all, they don't like transplanting and tend to die soon afterwards. Second of all, if you're paying a plumber, it's going to cost you that $150 fee for him to come back out and put you a new one in, plus the $200 for the disposal. Right now, when he's installing everything, you're going to get charged for all of that anyway. Might as well put a new one in when the rest of the sink is installed.

And, if you're DIY, it's just a big hassle to uninstall a disposal and reinstall a new one. Save yourself that and just buy a new one. The Evolution series is the way to go . Super quiet and do the job you expect them to do.

And yes, most kitchen remodels will need to lower the waste arm into the wall. It's not a big deal when the cabinets are out. It's easy. If the cabinets are in place, it's not as easy. But, it's still not a big deal. Unless your plumber is a drama queen. Surprisingly, many are.