I need to plumb into an existing ABS drain, labelled as "ABS/DWV 1 1/4" schedule 40 ", but for the life of me cant find any 1 1/4" fittings!!!

Photograph of pipe showing labelling

My suspicion is that the pipe is 1 1/4" ID, and I need to buy 1 1/2" OD fittings.

Before I trundle down to Home Depot, is anyone able to confirm my suspicion (or do I have the most useless, redundant piping ever?


  • You may need to trundle down to a plumbing supply place; it's probably an uncommon size. Commented Apr 16, 2018 at 2:33

1 Answer 1


They definitely exist (in Canada at least).

Sample "big box" listing for "abs 1 1/4" :


  • I am sure that ABS DWV Schedule 40 is legal to use where I live, but it does not in fact appear to be used here in new construction. Every new installation I see now in the City of Dallas is PVC schedule 40. The drains in our 47-year-old Fox and Jacobs tract house in Dallas are plumbed in ABS, but I am not aware of any other ABS installations here. Commented Apr 16, 2018 at 10:04
  • Levi, where is this installation of ABS drains? Commented Apr 16, 2018 at 10:20
  • Thanks Jeff - I looked at HD & Lowes, but did not actually check Rona!
    – Levi
    Commented Apr 16, 2018 at 17:54
  • Jim - This install is in Ontario.
    – Levi
    Commented Apr 16, 2018 at 17:55

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.