I need to add a utility sink and the drain would connect directly into my main stack (see attached picture). Is it possible to add a connection to the main cast iron stack, without cutting out a section and adding a new fitting? Basically, I am suggesting cutting a hole in the side if the cast iron stack and adding a saddle Wye (see picture)my stack as it is now.
Plumbing – Adding a utility sink drain to the main to the main cast iron stack
plumbing
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Best Answer
My understanding is that saddle wyes are prohibited under most codes, but you should check with your local jurisdiction to be sure.
The usual way is to support the pipe top and bottom, cut out a section, and then put in the new wye with hubless rubber connectors.