Galvanized Drain Pipe Leak

Under my house, I recently noticed some puddling water. After some further research, I think I have nailed down the problem.

I believe my leak is occurring at the seam of a cast iron Y. Coming in the top of the Y is my bath/shower drain. This has all been replaced with plastic from the drain to near the Y. The other inlet is a galvanized drain that has since been abandoned. The pipe goes probably about 15' and then is capped. It seems that when draining the bath, the water backs up some into the abandoned pipe and is leaking at the joint between the Y and the abandoned galvanized drain line.

Why it was capped at the end, and not removed and plugged at the Y seems unusual to me. It also seems a little scary, as I would assume it is because they were unable to remove the pipe for some reason.

EDITED:
Below are a few pictures of the leak.

Thoughts? Solutions? Thanks!

If you have no need of that line, I'd pull it out and put a plug in the end. If you drill out some of the lead around the joint, you'll be able to eventually pry out the lead and oakum (oiled hemp), clean it up, then put in a plug. It appears to be a leaded joint. If it is a threaded joint, you still should be able to get it out, but the threads will probably not seal if you tried a normal plug, but they do make one that will fit.

I went and did some measurements.

From what I can tell, the circumference of the lip of the wye is 12", thus, if my calculations are correct (12/pi), the diameter of the wye at the lip is about 3.8". At the plumbing store this evening, I saw some 4" rubber caps and some rubber "sleeves" that went from 4" to 2", CI to ABS. These both were the type that had the hose clamps around the outside. I'm not sure what the inside diameter of these caps were, I'm guessing they're too big. Anyone know if they make caps that fit what I'm working with?

I was thinking I would simply take out the joint and the pipe and either put the plug over it, or use the sleeve, throw on a short piece of ABS and cap it (probably not worth the effort if they already make a cap). Thoughts?

Thanks.

If you use that type of connector, you need to use the no hub or banded coupler. They are similar to what you describe, but have a fully stainless steel band over the whole unit. The neoprene sleeves are OK for underground but don't support the joint well enough for above ground. These are very useful to transition for one pipe material to another, but you do have to have the right size for both pipes.

Are any of these no hub fittings caps? Or will I need to go and purchase a no hub fitting, short piece of ABS and a cap?

They are just sleeve type connectors. Since it would be just for the cap, the neoprene Fernco sleeve should be OK.

Torch out the lead pull out the oakum and the old pipe.
Put in a Fernco donut.http://www.fernco.com/Donut.asp



Then install a cleanout adapter and plug in place of that abandoned pipe.
You can never have too many cleanouts in a building!

Caps are not designed to fit over a hub, only over the end of a piece of cut pipe. THere are plugs if it is threaded, otherwise, insert a donut, a short piece of pipe , and a cap or cleanout as indicated.

I normally drill out the lead, and pry out the lead with a screwdriver.
Something like a 1/4" bit, a bunch of holes works well.
Then you press the rubber insert in the hub, taper the end of the pipe, slather it with liquid soap, and pound it in.

On vertical lead faces like you have a torch will melt the lead out...
Drilling and prying works but is more time consuming...
If the lead face is horizontal dreilling and prying is your only option.

jadnashua said:

Caps are not designed to fit over a hub, only over the end of a piece of cut pipe. THere are plugs if it is threaded, otherwise, insert a donut, a short piece of pipe , and a cap or cleanout as indicated.

Click to expand...

Fernco does make cap that fits over the hub.

And when it still leaks some after the donut?

It shouldn't... Did you clean out all the old lead, rust, and oakum?
How did the hub of the wye look?