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Hi my name is ***** ***** I have been in the plumbing field for 20 years. I will be glad to help you today. The best thing to do would be to replace the pipe with 2" if that is an option. If it is a crawl space then certainly just replace the whole pipe with 2". Otherwise put a 2x1 1/2 coupling above the trap if there is room or put a 2x1 1/2 bushing in the shower drain depending on the shower drain you are using.
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