1 and 1/2 inch trap adapter for 2 inch drain?

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[dlarrivee]

and there is no way to access drain underfloor to reduce it to a 1 1/2 inch drain with out tearing out our new drywall.

That is not the fault of plumbing fitting manufacturers...

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[hj]

What you need is a 2 inch "TopKap" cleanout fitting. It comes with a 1 1/2" plug, but you will throw that away. Glue the TopKap into the 2" pipe, then screw a BRASS 1 1/2" male trap adapter/Marvel connector into the cleanout's thread using pipe dope or tape on the thread.

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[hj]

I do not go into Lowes very often so I cannot say. Some hardware stores may have it, and I think I have seen them at Home Depot. If they do they will be with the cleanout fittings and plugs.