New sink strainer tailpiece washer, flat rubber or flanged

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Djarchow

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I am about to install a new Kohler Duostrainer sink strainer in a bar sink. The strainer came with a flat rubber washer for the tailpiece. The Oatey P trap instruction say to use a flanged washer for the included Oatey tailpiece but doesn't include one. Is the flanged washer the better choice?

Thanks for any help!
 
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