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 Connecting cast iron to pvc
Author: IBBriley (VA)

Is there a coupling that can be used to connect 40s era cast iron to like sized pvc pipe?
I want to cut into an existing horizontal 4" cast iron drain with a short piece of 4" pvc with tees so I can connect a new fixture to the system.

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 Re: Connecting cast iron to pvc
Author: bernabeu (SC)

yes

[www.plumbingsupply.com]




1
Uncover the cast iron pipe you will be hooking into from the wall. Give yourself a good area to work in.

2
Place one end of the no-hub coupling on the cast iron pipe. Tighten the bolts on the coupling which are over the cast iron pipe with the socket wrench.

3
Place the PVC pipe into the other end of the coupling. Make sure the PVC pipe is securely in the coupling and the end of the PVC is flush with the end of the cast iron.

4
Tighten the bands on the coupling over the PVC pipe with the socket wrench. This will connect the two pipes together.

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

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 Re: Connecting cast iron to pvc
Author: packy (MA)

illegal in massachusetts. if we are inserting a tee or wye into a pipe, it must be the same material. we are allowed to transition to a different material from the branch of the new fitting.
so a no hub ty or wye is what we must use.

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 Re: Connecting cast iron to pvc
Author: bernabeu (SC)

so ... use a 'no-hub' (T) fitting in lieu of a PVC fitting

the 'tricky' part is cutting the cast iron 'neatly' (may want to get an actual plumber)



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



Edited 1 times.

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 Re: Connecting cast iron to pvc
Author: packy (MA)

yeah, cast iron pipe from the 40's could be brittle or even corroded.

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 Re: Connecting cast iron to pvc
Author: bernabeu (SC)

for the occasional precision cut on older CI:

pricey ($15 each) but effective

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

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 Re: Connecting cast iron to pvc
Author: bernabeu (SC)

YEEEAAAAAH ! REAL PLUMBING WORK ! LEMME AT IT !

Don't forget the new 13 amp Sawz-All !

OR

Really open the walls and use a three piece 'dutchman'! (replace/inset 3 pieces of bell & spigot CI and you can wriggle them into place on existing lines and actually caulk and pour joints)

just kidding ... too much work ... just cut out for and clamp in the no-hub branch fitting

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



Edited 3 times.

Post Reply

 Re: Connecting cast iron to pvc
Author: hj (AZ)

quote; you can wriggle them into place on existing lines and actually caulk and pour joints)

why go to all that work when a single "sisson joint" will do the same thing?

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 Re: Connecting cast iron to pvc
Author: bernabeu (SC)

'sisson' joint may or may not be code compliant .... either way it will NOT leave a 'smooth integral bore' which is the desired goal for a drain-pipe


sort of like making an addition to a home in such a shoddy manner that you can readilly tell it's an addition


yeah yeah yeah .... i'm old (fashioned)

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

Post Reply

 Re: Connecting cast iron to pvc
Author: sum (FL)

Packy, that is interesting in MA you cannot transition to a different material except at a branch.

So in his case, he would have to use a no-hub WYE, and connect CI to CI on both ends with no hub couplings. Then on the branch, connect to a PVC no hub adapter that's glued to a PVC pipe, right?

My question is, let's say he measured the length of the CI wye, then cut out a section, but the "GAP" turns out to be say 1" too long. What would you do to remedy that situation? Do you just leave 1/2" of slack on both ends with the no hub couplings? Or would you cut out another section long enough to put in another no hub coupling?

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