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Old 09-27-2015, 05:12 PM   #1
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Another Utility Sink Plumbing Question.


I know this has been beat to death on here, but I wanted to share some pictures of my drain set-up. I want to install a utility sink in my basement next to the washer. The drain for the washer enters the concrete wall and is about 2 feet off the ground. The main 3 in drain also enters the concrete wall well above the washer and proposed new sink level. Without busting up the wall (which also supports the house) to expose the drain, I think my only option is to add a pump to the drain. Hopefully the attached pictures will help.

The first pic is the drain from the washer. The second pic is the main drain coming from the upstairs bathrooms and entering into the concrete wall.

Could I tap into the washer drain, using a pump and a P trap for the sink? Or would it be better to tap into the 3in main drain line? The pump I'm looking at does not require a vent.

Any advice would be greatly appreciated.
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Last edited by wkumtrider; 09-27-2015 at 05:23 PM.
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Old 09-27-2015, 05:19 PM   #2
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OK so where's the pictures?

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Old 09-27-2015, 05:24 PM   #3
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Sorry about the pics. Don't know how to rotate them to be upright.
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Old 09-27-2015, 05:32 PM   #4
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I see the pictures--but I can't figure out why there would be a P-trap on a line from the upstairs sink--could you step back a bit and take another picture showing the whole set up?
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Old 09-27-2015, 07:59 PM   #5
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Again, sorry about the rotated pics. The first pic is the drain from the washer. The p trap is for the washer which is just to the right of the p trap. The second pic is about 5 ft to the right of the washer drain. This is the main drain from the upstairs bathrooms. It doesn't have a p trap. I will try to get an overall pic but it is kind of difficult due to the way it is set up.
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Old 09-27-2015, 09:05 PM   #6
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That explains the P-trap---

Odd set up---I've never seen a 3" line inside of a foundation wall--A pump box or pit might be the simplest way to accomplish your new plumbing.-

I have never heard of a sump pit or sump box that did not need a vent---
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Old 09-28-2015, 07:39 AM   #7
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I'd put the pump where you want it and pipe the ejection line to the main stack-not the 2" washer.
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Old 09-28-2015, 07:42 AM   #8
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Replace the existing sump with sealed sump and drain into it?
1. Connect the pump drain to the sewer. This, I think, is against the rule but don't get it inspected. If you sell the house, you may have to remove the sink and reconnect the outside drain. French drain water (and gutter water) is not allowed into the sewer-not to overload the water treatment.
2. Use AAV (size larger) on a sealed sump? Plumbers, is AAV allowed to be used like this?
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Old 09-28-2015, 12:38 PM   #9
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Oh' Mike, this is the pump I was looking at: http://www.flotecpump.com/Residentia...FPUS1860A.aspx

According to the description it does not require a trap or vent.
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Old 09-28-2015, 05:04 PM   #10
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If you want to do it correctly you will need a laundry bucket sump. The discharge of the sump should tie into 4 inch drain where it exits the house. The vent for the grey water sump just take it up to the joist and turn it down with 2 90's.
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Old 09-29-2015, 11:05 AM   #11
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Thanks Ghostmaker
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Old 09-29-2015, 07:47 PM   #12
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Here is a better overall picture of the plumbing. I plan to move the washer to the right and sit the utility sink in the current washer location.

You can see the kitchen sink drain ties into the main drain. Could I tap the utility sink drain into the kitchen sink drain? Would I still need to vent the utility sink if I tied into the kitchen sink drain?

Thanks.
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Old 09-29-2015, 09:47 PM   #13
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Do not tie the pump into the small drains. The pump is a mechanical discharge and is very hard on the little drains. Cut a 3 by 1.5 inch wye into the main stack below your kitchen sink connection. Use Proflex band couplings to fit it in the 3 inch stack. As long as everything above is vented correctly you should have no traps get pulled. By the way your vent on the KS is below it's trap so it would be illegal in my state.

Last edited by Ghostmaker; 09-29-2015 at 09:49 PM.
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Old 09-30-2015, 06:19 AM   #14
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Thanks again Ghostmaker. Not sure if the vent is to code or not, it was like that when we purchased the house 7 yrs ago.
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Old 10-09-2015, 06:58 AM   #15
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Is it possible to tie the vent for a utility pump into the vent of the kitchen sink, as seen in the picture?
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