Underneath the kitchen sink

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Old 03-31-17, 07:38 AM
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Underneath the kitchen sink

Hello all, underneath our kitchen sink is a mess, it stinks, it leaks, the previous owner used to pour hot grease or oil down it. Both sides frequently clog and often water will come up through the right side sink drain. We only use the right side sink drain as a spot to put a strainer to dry dishes.

I am handy enough to replace the guts myself, I think I recall that a plumber once told me the pipe needs to be lower on one side.

My question is, what should I do to make this situation better when I replace all the pipes? It's like we have 3/4" pipes going into 1 1/4" pipes..

I don't know enough about plumbing to design a better layout. Sorry the photos are mostly the same.

Any help would be appreciated. Thank you for your time.
 
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Old 03-31-17, 08:07 AM
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That certainly is unusual. For openers, is that 2" PVC tee perhaps lower than where the pipe enters the wall. I doesn't look like it has much gradient at best.

My usual approach to these is exiting the disposal with a straight flanged tailpiece, go straight across and tie in to the other sink tailpiece with a disposal tee, then install a 1-1/2 slip trap below that and head for the wall.
 
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Old 03-31-17, 08:38 AM
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Also, if the previous owners did have a habit of pouring grease down the drain replacing the piping underneath the sink may not solve your slow drain or clogging problem. I would certainly start with the under the sink bits but if your clogging continues you may need to have your drain line snaked or replaced. Often the grease doesn't cool until a bit further down the pipe where it hardens and sticks to the sides of the pipe forming a clog.
 
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Old 03-31-17, 09:36 AM
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The problem with your sink is the tee in the wall is too high. Water is travelling up hill when it leaves the trap and that won't work.
The trap needs to be connected directly to the pipe coming out of the wall, not with an elbow going down. The top of the trap will be about at the yellow line in picture:

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Once trap is connected you might be able to use a center outlet waste:

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The left arm in the diagram will be replaced with a straight flanged tailpiece as Handyman663 said.

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Old 03-31-17, 03:01 PM
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Wow, Thank you all so much for the advice!

So it sounds like I need a straight pipe out of the disposal, joining up to the other sinks 90 elbow with a "disposal tee" in the center with a 90 or a 45 going straight into the wall?

Is the "disposal tee" basically a T joint shown in the pic A circled in yellow? Or is it a T with a trap drain as shown in Pic B circled in Red?

Also i attached a pic from the other side.

I found the last diagram online, is there any reason to go with C over D?

What is a center outlet waste?

Thanks Again!

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Old 03-31-17, 04:42 PM
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Your plumbing needs to look like the "C" diagram above, double sink center waste.
You need a trap and the slip tube tee connects to the trap and splits.
 
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Old 03-31-17, 05:17 PM
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Thanks so much, sorry to be dense, but to Confirm 1 is the slip tube tee, and 2 is the trap?

What do I do if the wall connection is higher than the trap end?

It is possible I can lower the wall connection, but that would involve cutting the counter back.

Thanks again!



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Old 03-31-17, 07:14 PM
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Yes 1 is a double baffle slip tee and 2 is a slip tube trap. You can also use a pvc trap like what you have but it must connect straight to the wall.
Here's a kit at HD: Everbilt 1.5 in. Plastic Center Outlet Waste-C9123AB - The Home Depot

This will be very close to not working. You need to cut the tee as short as possible leaving room for a nut and washer to connect it to trap.
If the tee is still too high to go straight into the disposer, you need to lose the disposer or go into the wall and lower the tee.
You could also get a new disposer. An ISE evolution series has a slightly higher discharge outlet if that would do it.
 
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Old 03-31-17, 08:14 PM
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"If the tee is still too high to go straight into the disposer, you need to lose the disposer or go into the wall and lower the tee."

Do you mean if the the Tee with the trap is still too high?

Why on earth would the wall inlet be so high?


" you need to lose the disposer or go into the wall and lower the tee."

Lose the garbage disposal or go into the wall and lower the inlet?

I appreciate your patience, the terminology is new to me.
 
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Old 03-31-17, 09:03 PM
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Speaking of loosing stuff you need to get rid of all the glued up crap and use slip fittings if you hadn't already guessed that. They are easier to adjust and easier to redo if you need to part way through.
 
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Old 04-01-17, 04:15 AM
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Roger that Ray


So is the upshot that the Tee needs to be about the wall inlet?
 
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Old 04-01-17, 07:37 AM
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Just for reference...





 
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Old 04-01-17, 07:48 PM
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Again,
Thanks for all the advice, so here it is, give it to me straight..

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Thanks!
 
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Old 04-01-17, 08:34 PM
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Good job. Enters low enough it should be okay and I imagine your boss is happy for the extra room under the sink.
 
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Old 04-01-17, 10:06 PM
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I'll give it to you straight, that's beautiful.
 
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Old 04-02-17, 03:14 AM
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Thank you for the help all, and the feedback..
 
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Old 04-02-17, 07:12 AM
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WOW, what a difference.
 
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Old 04-02-17, 09:47 AM
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So as you can see in the before there is paper towel jammed in between the downspout of the disposal drain, i thought this was a bad gasket, not so much it was leaking from the case. We i got a solid 12 out of the disposal so i can't complain.

Here is the replacement, 1/8 hp more power, double grind, super quiet


https://www.insinkerator.com/us/en/e...rbage-disposal


FYI - I buy lowes 10% off coupons here..

Lowes Printable Coupon 10% off and Home Depot Coupons


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