connecting PVC to cast iron vent stack
 

II have a drain that goes from ABS to lead pipe to the cast iron vent
stack and I want to get rid of the lead and replace with PVC while I
still have the ceiling open.

The vent stack has a four inch (approximately) opening. It looks like
a copper adapter, around 2.5 inches, comies out of that. I have no
idea how it's attached...it's quite a bit smaller than the opening in
the vent pipe and it looks like there is some kind of flax holding it
in.

Anyone know how to get rid of the copper adapter and attach PVC
directly to the vent stack? The lead pipe is attached to the adapter
with some kind of footbal shaped lead "weld".
Any input is much appreciated.

connecting PVC to cast iron vent stack
 

TrueWest wrote:

II have a drain that goes from ABS to lead pipe to the cast iron vent
stack and I want to get rid of the lead and replace with PVC while I
still have the ceiling open.

The vent stack has a four inch (approximately) opening. It looks like
a copper adapter, around 2.5 inches, comies out of that. I have no
idea how it's attached...it's quite a bit smaller than the opening in
the vent pipe and it looks like there is some kind of flax holding it
in.

Anyone know how to get rid of the copper adapter and attach PVC
directly to the vent stack? The lead pipe is attached to the adapter
with some kind of footbal shaped lead "weld".
Any input is much appreciated.


There is a brass adapter which has been "leaded" into the cast iron
hub in the stack fitting. The "football" is lead which has been
wiped over the connection.

You can drill out the lead by making a series of 1/4" holes around
the circumference. Then pry out the lead and the Oakum behind it.
That will leave the raw cast iron hub. You can then get a "donut"
rubber adapter which will connect PVC to the hub.

It's also possible to leave the brass adapter in the hub and use a
FERNCO No-Hub coupling over the end of the adapter sticking out.
You may have to remove the wiped "football".

Jim

connecting PVC to cast iron vent stack
 

There is a brass adapter which has been "leaded" into the cast iron
hub in the stack fitting. The "football" is lead which has been
wiped over the connection.

You can drill out the lead by making a series of 1/4" holes around
the circumference. Then pry out the lead and the Oakum behind it.
That will leave the raw cast iron hub. You can then get a "donut"
rubber adapter which will connect PVC to the hub.

It's also possible to leave the brass adapter in the hub and use a
FERNCO No-Hub coupling over the end of the adapter sticking out.
You may have to remove the wiped "football".

Jim

Thank you very much.
Id prefer to leave the adapter in. What's involved in removing the
wiped "football"? Just a chisel and some elbow grease?

connecting PVC to cast iron vent stack
 

TrueWest wrote:

There is a brass adapter which has been "leaded" into the cast iron
hub in the stack fitting. The "football" is lead which has been
wiped over the connection.

You can drill out the lead by making a series of 1/4" holes around
the circumference. Then pry out the lead and the Oakum behind it.
That will leave the raw cast iron hub. You can then get a "donut"
rubber adapter which will connect PVC to the hub.

It's also possible to leave the brass adapter in the hub and use a
FERNCO No-Hub coupling over the end of the adapter sticking out.
You may have to remove the wiped "football".

Jim

Thank you very much.
Id prefer to leave the adapter in. What's involved in removing the
wiped "football"? Just a chisel and some elbow grease?

Yes, perhaps a hacksaw to cut thru the lead in several place;
that will allow the chisel to "peel" it off. Rasp to file the
roughness left.
Jim