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 Adding a sink drain to a clean out
Author: Hvac2000 (IL)

Hi! I am trying to add a 1 1/2 sink drain from a 3 1/2 inch cast iron clean out threaded plug. The threaded cap is 3 1/2 inches. I would like to find a fitting that fits in the threaded clean out that is 3 1/2 inches then come up with a 3 inch sanitary Y to 1 1/2 inch. I tried the rubber barbed connector but it is not tight. Then i will be using that 1 1/2 are vent for venting purposes. Can anyone help me? Thanks!

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 Re: Adding a sink drain to a clean out
Author: packy (MA)

probably not the best idea but i have seen it done many. many times.
just get a 3 1/2 x 2 inch bushing and install the connection to it so it can be take apart and unscrewed if needed.

Edited 1 times.

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 Re: Adding a sink drain to a clean out
Author: stuckinlodi (MO)

That will work but Yikes, 56 dollars for a bushing? Must be for a federal government building. {grin}

[edited, something happened to part of my post?? probably moderated due to restriction on advertising?]

Edited 4 times.

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 Re: Adding a sink drain to a clean out
Author: hj (AZ)

No. It is the cost of an "obsolete" fitting. That and a 3 1/2" x 1 1/2" bushing are about the ONLY fittings made in that size, and, since it is about the only thing they are used for, DEMAND is super extremely low, which raises the cost of production, and inventory.

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