Bushing to convert straight thread to tapered pipe thread

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Cabbydog

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Greetings,
I acquired a redwood barrel hot tub in pieces. The existing drain in one of the floor boards appears to be a stock thick walled 1-1/4″ steel sink drain w/o overflow with fine threading. I want to connect this to PVC Street elbow and PVC pipe with PVC ball valve terminus. Is there a bushing that converts fine threads to pipe threads? If so, who has it?
If not, any suggestions in a drain fitting ( floor board is 1-3/4 thick)
Thank you in advance
 
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