Plumbing – Do they make 1.5/1.5/2 combo wye (and is that what I need)

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Looking to add a bar sink. There is already an existing DWV stack that I believe is dedicated for this (based on location and model homes, etc). This is a diagram of what I'm working with and the fittings I was planning on using (0 is the sink where the P-trap will go horizontal to the back wall)

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  1. 90 degree long sweep along the horizontal plane
  2. 45 degree elbow
  3. 45 degree elbow
  4. 1.5"/1.5"/1.5" sanitary tee
  5. 90 degree 1.5" vent elbow
  6. 1.5"/1.5"/1.5" sanitary tee
  7. 2"(bottom)/1.5"/1.5" combo wye

Does this look right? Is there such thing as #7? (seems like most of the combo wye I've found are 2" top bottom). If not, what would be the best way to go from the 2" at #7 to the 1.5" at #6?

Also, if I install a P-trap with a union coupling at #0, that would allow me to take the P-trap off. Would that be sufficient as far as a cleanout is concerned? I'd like to avoid putting a cleanout cover in the wall if at all possible.

Best Answer

Since it is a vent to waste transition and not a waste to waste transition -- I would consider a 1.5" to 2" reducer fitting atop a 1.5"/2" combo wye acceptable (the vent line doesn't care).

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