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-   -   The age old disposal issue - high drain (http://www.diychatroom.com/f7/age-old-disposal-issue-high-drain-156637/)

hyunelan2 09-12-2012 07:23 PM

The age old disposal issue - high drain
 
First, monkey's built my house. We'll just leave it at that.

Today we had new granite countertops and an undermount sink installed. I went to put in the disposal (GE GFC530V), but of course the undermount sink is lower than a drop-in. The exit line from the disposal is sitting right about level with the drain stub coming from the back wall. I am getting very slow drainage. I know the issue is the disposal needs to be mounted higher, so the main drain would need to be lowered. Not really possible with cabinets and countertops now installed.

THE QUESTION:
So, is there a disposal out there that mounts closer to the sink, or maybe a replacement flange that is not as long as what comes with the disposal? If so, then I could have the disposal mounted up closer to the sink. That would put the exit line from the disposal higher above the drain line.

oh'mike 09-12-2012 07:32 PM

You are in trouble----that GE has the same height as In-sink-erato----I do believe---

Take a picture if you still have the disposer installed.

I suggest you get out your multi-tool (Harbor Freight?) and open the back of your nice new cabinet---lower the drain---make a repair panel---then add your two P traps and figure out the best configuration for the drain T and piping.

You will spend more time going to the store that redoing the piping---It's not highly advanced plumbing---Mike----

hyunelan2 09-12-2012 09:43 PM

Boo. But I don't WANNA cut open the cabinet and wall *stops feet and throws temper tantrum*

I uninstalled the disposal and put in a sink drain for the time-being. I measured to see how high off the floor the drain pipe is coming out of the wall. It is twenty-one inches off the floor. Isn't the acceptable region somewhere around 12"? Like I said, monkey's built this house.

I did look at some detailed specs from GE, and the model I have actually requires almost an inch more than the model below it. I have 8.75" from the bottom of the sink to the pipe. My model wants 10". The lesser model wants 9". I am thinking 9" is pretty close and I might give it a shot. If that's a no-go, looks like it's time to tear into the wall (cries).

FWIW, here is my current temporary plumbing.
http://www.hamflaps.com/uploader/files/4/undersink.JPG

Alan 09-12-2012 09:57 PM

I see you bought in on the delta gimmick. :001_tongue:


Could you do THIS if you had a direct connect tee on the low side and the disposer on the high side? Are you required to have separate traps? (we are not and they work fine so I would say if you can get it to hook up with a single trap then go for it)

oh'mike 09-12-2012 09:58 PM

The old standard height was 18"-----so your 21" is high to old standards---16 is about right----

I like to hang the P-traps before I make up the T- and other piping---

It's usually best to open the wall before you head out for parts----the T inside the wall could be a combination of 1 1/2 and 2 inch---

oh'mike 09-12-2012 09:59 PM

This area does require two traps----

Alan 09-12-2012 10:05 PM

I would still do it with a single trap if it meant not cutting your brand new cabinet back out. :laughing:

(not that that makes it right)

hyunelan2 09-12-2012 11:08 PM

Quote:

Originally Posted by Alan (Post 1008741)
I see you bought in on the delta gimmick. :001_tongue:


Could you do THIS if you had a direct connect tee on the low side and the disposer on the high side? Are you required to have separate traps? (we are not and they work fine so I would say if you can get it to hook up with a single trap then go for it)

Unfortunately my issue is that the outlet from the disposal is the same height as the pipe going into the wall. It doesn't matter how many traps I have, I still need some elevation change for the water to drain more than a trickle.

oh'mike 10-07-2012 07:10 AM

How about an update?

hyunelan2 02-21-2013 10:11 AM

Is 4 months too late for an update? I was looking for one of my other threads and found this.

I ended up taking the disposal back and buying the model that was one-step down. I figured it was worth a shot before cutting into the wall. With the higher outlet on the disposal, I was able to achieve normal drainage. In short, I got lucky.

joes plumbing 02-21-2013 10:50 AM

Why does your area require two traps makes no sense

joes plumbing 02-21-2013 10:52 AM

Use one deep seal trap and you can get the disposal to work

eclark 02-21-2013 06:20 PM

Or quit trying to wash garbage down the drain. What's the draw to disposals anyway?


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