I've attached a picture of what I want to tap into - it's a 3 inch main coming from the ground floor into the basement. This is in the basement. I want to add the fitting in the picture a few inches above the clean out. Since the stack won't move, I need to add a rubber Fernco (stainless steel covered) boot inline.

A few questions:

1) Does the boot go above or below the fitting?

2) Can I use a section of the pipe I cut out to glue into the fitting in order to attach the rubber boot to it...or does it need to be an unused section of pipe? Seems basic but just being sure.

3) The fernco fitting actually says it is to go between cast iron and plastic but both ends look identical and this is the one I was told to use at the supply store. Is that an issue?

Thanks.

1. Either is fine, but it your case I'd put it above.
2. Yes.
3. It'll be fine.
When you make the cut, you can pull the upper section away from the wall enough so that you can glue the tee on the lower section, and then reconnect with the banded coupling.

1. Maybe both depending on whether the pipe will deflect enough to install the tee

Really wish I would have read this last reply before the install. I got it in there and it doesn't leak but it was a tight squeeze. The pipes also aren't butted up against the seat on the rubber gasket. Things seem fine, though. Thoughts?

Did you prime the PVC joints, before gluing them?

Yes

Now, the question is, "What is that connection for", because it may NOT be the correct one, since it is not the fitting shown in your original picture.

It's for a bar sink...about 10 feet away.

uh-oh.

You will need to replace your installed "Y" fitting with a 'sanitary tee' (the first pic).

As is, you have created an 'S' trap because the 'drop' is more than the water seal of the 'P' trap at the fixture.

oops

to err is human

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"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638

If the main stack is for drainage of the floor(s) above, that branch you added can't use the main stack as it's vent and will need to have a separate vent installed. This new vent can usually tie into existing venting, with some limitations.

I'm tied into the vent already - there was a stub hanging from above near the other stub outs in the basement floor clearly meant to be the bathroom. That vent now has a tub, and dual lav as well as this sink on it. The toilet is wet vented from the dual lav drain.

I don't feel all that great about the way this drain doesn't seat against the rubber lip anyway so I'll probably redo it and add a second fernco with the first fitting. The stack won't budge an inch and I'm a little unclear how to gain enough space...even with two rubber boots. Is it ok if the pvc isn't almost butting up against each other in this boot? Seems like it should rest on that inner lip...Maybe it can get real close with the cut made just slightly bigger than the fitting (with the pvc glued in on top and bottom of fitting) and the rubber not rolled back.

as long as you have a "properly installed" vent it should be okay. You make the insertion "spool" slightly shorter than the opening and slide it in, the secure the couplings.



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if you don't have any play in the stack, you probably have the connection you describe as good as it is going to get.
leave it alone and enjoy life..

'Properly installed vent'...LOL. One of many things I don't know.

The sink going into the pictured stack has a vent that that ties into a vent line above where the picture was shot from. Just to the right of this stack (other side of wall) is a tub/shower with a 1.5 inch vent pipe. That runs directly to the stub hanging from the ceiling. The vent for bar sink to the left of the stack taps into this tub/shower vent before it joins the stub.

Theoretically speaking, inspection won't be part of this final process - function is key....if that helps.