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Thread: Running a drain for bathtub question

  1. #1

    Default Running a drain for bathtub question

    I am installing a new bathroom in my home and I have a bathtub that is facing away from the drain, IE it's a right facing drain with the wall plumbing on the left. I had started with 1 1/2" drain pipe from the stack when I realized I need to run 2" to complete the almost 5' run to the tub drain. My dilemma is with a 2" p-trap how do I connect this to the 1 1/2" "L" shaped tub drain fixture? Do they make a p-trap that connects a 2" to 1 1/2" drain? If there is I can't seem to find it at my local improvement box store. Any help would be great, thanks!

  2. #2
    DIY Senior Member thezster's Avatar
    Join Date
    Jul 2005
    Fort Collins, Colorado


    Assuming you're running PVC......... you should be able to easily find an adapter that reduces the 2inch trap to a 1 1/2 inch compression fitting. (I'm pushing Home Depot today as I just bought a bunch of shares)

    Is your trap at the end of the 5 1/2 foot run - or were you able to move it to the tub drain end of the line? You may have venting problems with this one.... and I'm sure a more experienced plumber type will jump in with a more professional opinion...

    Not a pro - just improvise when I need to...............
    Last edited by thezster; 08-18-2005 at 02:07 PM.

  3. #3


    I thought for sure there would be something like what you described, ie 2" to 1 1/2" fitting but I can't find it...would it be part of the trap assebly? Or would it be just a reducer with a compression fitting...I can't find a 2" to 1 1/2" compression fitting either. Anyone else?

    Also the trap is within the 5' venting limit for 2" pipe, it's also ABS...for some reason there is little to no (white) PVC to be found at HD or Lowes in Oregon! Go figure?!?

  4. #4
    DIY Senior Member sulconst2's Avatar
    Join Date
    Jul 2005
    old bridge nj


    you should be able to find a 2 to 1 1/2 reducer then a 1 1/2 trap adapter. might have to go to a supply house.

  5. #5


    sulconst2, That's what I'm using as a solution now, but I'm afraid it might be a little bit to tall...I'll have to set the tub to know for sure. I was hoping for a simpler solution then a bunch of adapters stacked on each other...but if that's what I have to do then that's what I'll have to do!

    Thanks for the advice.

  6. #6
    DIY Senior Member Cal's Avatar
    Join Date
    May 2005
    Northern Virginia


    Run your 2" line AND 2" p-trap. In the cup of the 2" p-trap that is looking up towards the tub,,,glue a 2 " x 1 1/2 " BUSHING .this should allow enough room for the rest of the fittings/drain .


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