Thanks for the post. Yes it is 6". I have it exposed and it matches
size with the 6" PVC. The donuts I referred to are Fernco. The 4" to
4" connector is a Pipeconx and has two metal straps at each end to seal
the connection so I am OK there.
Question: If I start at the cast iron and work to the T won't I have
trouble fitting into the T and making sure I don't change the position
and grade of the 6" line. The problem with the leak started because
there is a low spot in the line at the connections. I want to make
sure I don't recreate the problem.

Diagram
-- I I I
6" ============== each = is 1 foot
Low spot

DanG wrote:
I am having difficulty following your post.

Are you sure about 6" pipe? Schools and office buildings and
cities have 6" runs, but they would be rare in residential.

White PVC is the norm. Green is usually light weight drainage
pipe or really heavy pressure pipe with O ring seals.

Fernco or Mission couplings would be my choice for tying onto the
cast iron stub outs. These are made with different diameter ends
to transition from cast to clay or whatever and to change
diameters. Establish the fittings on the cast iron stub outs
first, cut the pipe runs as required. Make sure you have a clean
out at the head end of the pipe so you can rooter through the main
line and catch all the stubs outs.
______________________________
Keep the whole world singing . . . .
DanG (remove the sevens)




"kstar" wrote in message
oups.com...
The local 'big box' has 6' white IPS PVC DWV with cellular core.
I've
done a little research and it is unclear if I can use the white
PVC for
an outside replacement of the 6" Clay pipe. The codes on the
DWV pipe
indicate it is F-891-00, schedule 40, NSF, and JM 30/35. The
building
department for the city has told me I can use schedule 40. But
is the
white OK for US outside applications? I know green is usually
used.
Any advise is appreciated.