I live is southeastern michigan and I have just finished farming my basement. I want to put in a small bar with a sink. The problem is that the only place that I have to connect the drain is in the cast iron stack cleanout that is shown in the picture below. My original plan was to remove the cleanout cap and then put a T in it place that would allow me to hook up the sink as well as keeping the cleanout. Does anyone have any advice or best practices on this?
Removing the old cap in the cleanout looks like it is going to be a tough job as well.


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I would leave the cleanout as is, cut the vertical pipe and install a tee for the bar sink. It will need a vent as well, which in your case will probably be an AAV.

The pipe that you are referring to that needs to be cut is an old (1950s) cast iron stack pipe. I am nervous about cutting into it. Can you describe the process and the parts you would use to get everything back together?

I would use a Wheeler Rex ratcheting cast iron cutter to remove a section of piping. A PVC tee with a piece of pipe 3" long glued in both ends, 2 no hub bands to connect the PVC back to the cast iron. 10 minutes would be more than enough time to cut the pipe and clamp the tee into position. Make sure the cast pipe is supported so that it won't fall down when the piece of cut pipe is removed.

you could also drill out the lead that is holding the cleanout in place. a 1/4 inch bit making a whole bunch of holes and the cleanout will wiggle right out.
then get a 4 inch rubber insert gasket, a short piece of 4 inch PVC, a 4 x 2 sanitary tee and a 4 inch PVC end cleanout.

probably need some grease, a 2 x 4 block and a good size hammer to get the gasket and nipple pounded into the hub.

The picture is too dark to be sure, but the cleanout plug SHOULD be 3 1/2" ips and if so you will NOT find any fitting that will fit it, other than another plug, so your plan will NOT work.

I like Packy's suggestion the best, but NCP's will probably be most h/o practical. Except substitute an angle grinder with metal cut-off wheel for the Wheeler Rex chain cutter.

i don't think there is enough room to get the angle grinder behind the pipe.
so, grind as much as you can and sawzall the rest..
i am always afraid to use a chain cutter on old cast iron. too liable to get a loooong vertical crack..