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sink waste rubber washer?

how are you supposed to know which way up these big rubber washers are fitted? is the flat side sitting on the big plastic nut or against the sink drain hole
Dave-H, May 2013
The flat side against the nut,if it is ribbed the ribs can mould against the sink to seal it,use some silicone unless instructions say differently and don't overtighten.

Rich, May 2013