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Old 05-04-2015, 09:19 PM   #1
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New kitchen sink & disposal:


Iím replacing my old kitchen cabinet, the sink and faucet. The new sink is a single bowl with a garbage disposal. The drain is a floor drain through the cabinet bottom, at the very back of the cabinet, offset a few inches to the right. There is an existing vent coming in at the upper back right, passes through the adjacent cabinet then up and out.

Not sure if Iíve given enough info, but what is the correct way to plumb this?

New kitchen sink & disposal:-plumbing-1.jpg
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Old 05-04-2015, 09:29 PM   #2
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In a nut shell---you need a T-and then a pipe above to connect the vent--

I would wait until the sink--counter top and gargage disposer was mounted--then add the P-trap and see exactly where the best location is for the T- and the rest of the drain should be.

A licenced plumber will be along soon--Mike---
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Old 05-04-2015, 10:04 PM   #3
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mike- Not sure what you mean by a T in this application.

Any chance you have a diagram or a link to one?

Also, I know that S traps are illegal. But how can I use a P trap with a floor drain?

-Gary
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Old 05-04-2015, 10:10 PM   #4
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Because you have a vent---the 'floor pipe' is no different than a pipe inside the wall---so no S-trap will be created---a sanitary T---attached to the 'floor pipe' at the proper elevation--then another going from the top of the T into the vent---and you have a legal drain---then add whatever pipe and trap addaptor is needed to connect to the P-trap and your done.
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Old 05-04-2015, 10:27 PM   #5
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Quote:
Originally Posted by oldberkeley View Post
mike- Not sure what you mean by a T in this application.

Any chance you have a diagram or a link to one?

Also, I know that S traps are illegal. But how can I use a P trap with a floor drain?

-Gary
Do you have a trap below the floor? If so, it should be removed- then follow Mike's instructions
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Old 05-04-2015, 10:40 PM   #6
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No, no trap below the floor.

Thanks guys, will give it a try!
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Old 05-05-2015, 02:55 PM   #7
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Only problem I see is your vent must be 6 inches above the sink prior to a horizontal run. You actually need to run your drain into the wall install your tee to pick up the sink. then continue vertical to the vent.
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Old 05-05-2015, 05:23 PM   #8
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Ghostmaker- It is above the sink, starting in the wall behind the adjacent cabinet.

How long can the horizontal run be, starting at the point where the vent is 6 inches above the sink?
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Old 05-05-2015, 07:49 PM   #9
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I see the vent its below the sink top it is horizontal that is not allowed. The flood level rim of your sink is the point the water in the sink would run onto the floor if blocked. You cannot be less then a 45 degree angle on your vent until you are above 6 inches above the flood level rim.
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