What is a cast iron adaptor fitting?

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Jim Mills

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What the hell is this thing anyway?
adapter.jpg
 

Gary Swart

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I believe it is a PVC reducing coupler, probably 4" to 3". Your question asked about a CI adapter fitting. There are a couple of types. If one end of the cast is a bell end, you use a dough nut. If it is straight pipe, then a neoprene banded coupler is used. These come in different sizes because cast iron can have slightly different outside diameters.
 

Terry

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I believe it's supposed to have an end similar in size to No-Hub cast.
I have never bothered with those. You can pick up no-hub couplings that are sized plastic x cast. If you going to transitions between cast and plastic, just pick up the right coupling.
 

Tom Sawyer

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They make two types. One is called a caulking ferrule and it is used for transitioning between bell and spigot cast iron and the other is a transition coupling used with a no hub clamp but you can also get no hub to pvc clamps
 

hj

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A picture without anything to show dimensions is somewhat worthless. It could be a 4x3 bushing, or some kind of reducing coupling, depending on what the o.d. is.
 

Jim Mills

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Sorry HJ. I saw it at the big box store. The small end fits over a piece of 4" PVC. The larger end doesn't fit anything. Nobody in the plumbing department knew what it was either. I just replaced a section of 4" cast & used a shielded coupler. The cast & PVC were nearly identical diameter.
 

Reach4

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I have seen a transition from an existing cast iron drain from a bathroom above to the new PVC installed for overhead sewer being fed out the basement wall to a new trench to gravity-feed the upstairs bathroom sewage. The vertical cast iron was cut and inserted into a PVC fitting. I don't know what was packed in first, but the visible part was poured lead. This work was done in the naughties (200x).
 
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