Galvanized steel to PVC in bathroom: plumbing vent + tub drain

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Dan, Aug 29, 2020.

  1. gagecalman

    gagecalman Member

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  2. Dan

    Dan Member

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    great thanks, seems much sturdier. but how would i connect the straight tubular coming down from the tub?

    edit: the idea being the tubular ptrap allows me to take the 'trap' off, or twist/move it around to get at a clog, a clean out on top of prevent gas coming back up. woth that pvc trap, i would have to cement/glue one end so i wouldnt be able to use it as a clean out, correct?
     
  3. Dan

    Dan Member

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  4. wwhitney

    wwhitney Active Member

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    That's probably 1-1/2" galvanized. The OD should be 1.9", same as the 1-1/2" plastic you're using. The ID was originally 1.5", but as the steel rusts it can accumulate on the inside and reduce the ID. So it is worth replacing as much of it as is possible.

    Now if the OD is 1.6", that's 1-1/4" galvanized, which would be a problem.

    On the trap style (tubular, solvent weld + threaded, or solvent weld only), I don't have an opinion, I'll just point out that the first two options would let you open up the trap, the last option would not.

    Cheers, Wayne
     
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  5. Dan

    Dan Member

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    wayne, thanks. i found the no-hub coupling that fits: fernco P3000-150. you are correct, it is ~1.9 for the outer diameter.

    i will stick with what gagecalman posted above: pvc p-trap. 1.5".
    horizontal pipe will be 1.5" solvent welded
    vertical will have the 1.5" threaded adapter solvent welded accepting the vertical 1.5" tubular from the bathtub/shower
     
  6. wwhitney

    wwhitney Active Member

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    gagecalman posted two options for the p-trap: one where the two pieces thread together (and the inlet and outlet are solvent welded), and one where the two pieces solvent weld together. In conjunction with the trap adapter, the first option would let you remove the U-bend of the trap, while the second option would not.

    I've never used tubular on a tub waste and overflow, so I have no opinion.

    Cheers, Wayne
     
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  7. Dan

    Dan Member

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    thanks for clarifying and i should have been more clear in the post:

    i will be going with the option that allows me to remove the 'u-bend': https://www.lowes.com/pd/Charlotte-...ia-PVC-Schedule-40-Hub-P-Trap-Fitting/3132661
     
  8. Reach4

    Reach4 Well-Known Member

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  9. wwhitney

    wwhitney Active Member

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    That alone doesn't, but coupled with a trap adapter for the tubular drain from the tub, the u-bend can be removed. Or are you saying that on that style of two piece trap, the two pieces don't separate and are captive?

    Cheers, Wayne
     
  10. Dan

    Dan Member

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    yes youre right about the the u bend having two trap adapters

    this is what i am doing, im assuming this works?
     

    Attached Files:

  11. Dan

    Dan Member

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    dry fit photo



    15988133992345561117332305302545.jpg
     
  12. gagecalman

    gagecalman Member

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    That is a beautiful thing!
     
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  13. Dan

    Dan Member

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    couldda saved myself an extra 3 trips to hardware store searching for parts and all that cutting with a hacksaw.
     
  14. Dan

    Dan Member

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    heres the final job

    IMG_20200830_143426.jpg
     
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  15. Reach4

    Reach4 Well-Known Member

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    I see that now.

    Still required precision. Good work.
     
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