"Speedy Jim" wrote in message
...
DL wrote:
I am in the process of adding a sink in our family room section of our
basement. The only close drain is a 3" waste / drain line which is fine
because I can get a 3" X 1-1/2" X 3" Tee to run the 1-1/2" drain line
into.

My concern is since the 3" pipe is much more rigid than the smaller
sizes, how do I go about installing the tee section since there is
minimal to no upward movement of the 3" pvc pipe and I assume that I will
need the 1-1/2"+ needed to get the 3" pipe over the lip and seated
properly.

I saw was a 3" rubber sleeve with 2 metal band clamps that will do what I
want, but I am not sure they would be used for a permanent installation.

Do they make pvc sleeves that can be used like the copper sleeves for
in-place solders similar to the rubber sleeve mentioned above? If not
can I grind / sand out the separator in the middle of the connector so
that it can slide down and then be re-positioned similar to the 3" rubber
sleeve?

Any help would be appreciated.

Thanks,

David
1) Glue a couple of stubs to the fitting to be inserted.
Cut out a section of the 3" stack 1/2" longer than the
new fitting w/stubs. Get (2) 3" No-Hub fittings. These have
a stainless band over the whole rubber. Slide them over the
stubs. Put the fitting in place and then slide the No-Hubs
back halfway onto the stack. Tighten.

2) Use a 3 X 1 1/2" WYE or long-turn TEE-WYE, not a san TEE.

3) The 1 1/2" drain must be vented downstream of the trap
to prevent siphoning since the stack already carries waste
from above. This may be the kink in the scheme.

Depending on local rules, you *might* be allowed to
use a mechanical vent (air-admittance valve).
Strongly suggest a talk with the inspector first.

Jim

Jim,

Good idea on the stubs and two rubber sleeves. I was hoping that there will
be enough flex so that I would only need one rubber sleeve, but I will take
your suggestion just to be on the safe side. Since the bottom side is in
concrete, there will be no movement. Once I cut the pipe, I will be able to
better access the situation to see how much upward flex I have. I think
your suggestion will be the best way to handle it.

What is the difference between a WYE Tee and a San Tee? From the two
different styles I saw at the HD (though I don't remember the names), they
look to be the same on the 3" ends, just different ways of connecting the
1-1/2" sink drain. I assume that this is to prevent the waste from getting
into the drain line?

I have already gotten approval for an in-line vent from the county
inspection office. Worse case, I can tap into a vent line in another
portion of the house that is fairly easy to access, but I prefer the in-line
vent.

Thanks for your help,

David