Question about connecting 2" PVC to cast iron hub

[kevreh]

This cast iron hub has a 1.5" drain for a tub/shower combo. I'm converting the tub to shower only and want to go 2". I can't tell if its possible with this hub. There's a Fernco connecting the 1.5" pipe adapter, but what's the Fernco connected to on the hub, a 2" pipe stub or something? Or is it a 1.5" stub?


Thanks

 

[Terry]

That's pretty strange looking. Is that a 2" cast fitting with a side inlet?
PVC going up the top, and ABS out the side?
And if the side is for a tub, where is the p-trap for it? Normally no-hub cast fittings start with 2" and if that is what you have, the pulling out the pipe that looks to be reduced gets you back to 2".

 

[Sponsor]

 

[kevreh]

The P trap is a couple feet away.

Its a 3" hub, toilet flange is the white pvc at top of photo. That first fitting, below the Fernco on the photo, is iron. So maybe they used that to reduce to 1.5"? The fitting after the iron adapter is ABS.

Is that 2" cast stub coming off the hub the same diameter as a 2" PVC, connected using a Fernco?

 

[Terry]

The shielded couplings come in many sizes. No-Hub is a little different then the plastic sizing. They make one that fits both sizes as a transition.

 

[kevreh]

Thanks Terry, sent you a tip

 

[kevreh]

And here’s the after. The 2” stub that was leading to the tub was 75% full of gunk. Not sure if it was from the shower, or waste from the 3” stub connected to the toilet. These types of hubs seem like a bad idea because the toilet waste can go into the 2” stub. Oh well it’s done now.