I need to have washer and laundry sink installed in my basement. Washer drain needs to be 2". I have only 1 1/2" pipe. Do I need to replace that cleanup box? Lokks like all this is glued together. I'm wondering if there is a way to keep existing cleanup box. I do want to do everything by code. See the image. enter image description here

  • Are you sure that the size of the Floor Cleanout is 2"? In the picture it appears that it may be more like 3". – Michael Karas Sep 19 '18 at 11:44
  • Yes, the cleanout box have opening about 3" or 4" and has transitional piece from 3" or 4" to 1 1/2. It looks like all that is glued together,,, – DmitriD Sep 19 '18 at 12:03

They make ABS pipe adapters that go from 1 1/2" size to 2" size. They do take up some vertical space so that TEE that you now have just above the 2" piece will have to be moved up to higher position.

Here is an example of one type of adapter:

enter image description here

(Picture source from Home Depot Web Page)

  • Will that be allowed by code? I'm under impression that drain pipe can only transition from smaller diameter to bigger. – DmitriD Sep 19 '18 at 12:07
  • @DmitriD - The adapter shown is designed to glue onto the end of a 1 1/2" pipe and then the resulting end placed into a place a 2" pipe would normally it. I do not see how that in any way creates a situation where the transition from your 1 1/2" drain line gets smaller on its way to the larger size on the cleanout box. If the size on the top of the cleanout box is currently 3" then you may need an additional 2" to 3" adapter similar to what I have shown above. – Michael Karas Sep 19 '18 at 12:15
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    @Michael, I think the 1 1/2" in the picture is already glued into the cleanout fitting. He wants to remove the 1 1/2" and replace it with 2". – Platinum Goose Sep 19 '18 at 13:46
  • @PlatinumGoose - I now see what you mean. I missed that they want to add a new 2" pipe to the mix. In that case the OP is going to have to replace the cleanout box with something different. – Michael Karas Sep 19 '18 at 14:19

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