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No and yes.

Amendment (not from a professional plumber!): If you were simply running the sink drain into the shower drain and if there was not a reduction in pipe size, I would think you would be able to do that. I think the reason you need a trap for the sink has to do with code that requires a trap be no more than 24" from the basin to the trap arm. That being said, the pedestal sink in my house does not have a trap until after it drains below the floor.

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Q: Can you use the existing shower drain for a pedestal sink and do you need a trap for the sink since there is already a trap in the floor?
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