Question about connecting 2" PVC to cast iron hub

Discussion in 'Shower & Bathtub Forum & Blog' started by kevreh, Jan 13, 2021.

  1. kevreh

    kevreh New Member

    Joined:
    Oct 17, 2018
    Location:
    Virginia
    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


    IMG_3430.jpeg

    [​IMG]
     
  2. Terry

    Terry Administrator Staff Member

    Joined:
    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
    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".
     
  3. Sponsor

    Sponsor Paid Advertisement

     
  4. kevreh

    kevreh New Member

    Joined:
    Oct 17, 2018
    Location:
    Virginia
    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?
     
    Last edited: Jan 13, 2021
  5. Terry

    Terry Administrator Staff Member

    Joined:
    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
    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.

    [​IMG]
     
  6. kevreh

    kevreh New Member

    Joined:
    Oct 17, 2018
    Location:
    Virginia
    Thanks Terry, sent you a tip :)
     
    Terry likes this.
  7. kevreh

    kevreh New Member

    Joined:
    Oct 17, 2018
    Location:
    Virginia
    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.
     

    Attached Files:

Similar Threads: Question connecting
Forum Title Date
Shower & Bathtub Forum & Blog Question on shimming bathtub flange Jan 10, 2021
Shower & Bathtub Forum & Blog Question about flow rate and pipe diameter... Jan 5, 2021
Shower & Bathtub Forum & Blog Standard Shower Pan Size Question Dec 27, 2020
Shower & Bathtub Forum & Blog Question of shower p trap moving Nov 19, 2020
Shower & Bathtub Forum & Blog Concrete shower curb liner question Oct 26, 2020

Share This Page