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So I'm doing some stuff at my brother's, and one of the things is to replace the bottom of the cabinet under the kitchen sink, because it's been leaked on and is desperately sagging. But the drain piece comes so far down it's almost touching the bottom, which makes it difficult.

I'm guessing the cabinet is 36" high, and the bottom of the inside cabinet is about 4" from the actual condo floor. The connection to the building waste pipe is around 12" from the bottom of the cabinet. The sink tailpiece comes down, down, down so that the U-trap sits just an inch or two from the cabinet base, then rises again to meet the 12" level of the connection and then exits. (To be clear, the 12" sink tailpiece has another 15" extension and then there is a U-trap, which turns back up and reaches the level of the waste pipe. The waste pipe is cast iron, embedded in a concrete wall and cannot be changed.)

Any reason I can't move the U-trap up to a more normal height, let it "U", and then run back down to the connection? I would reclaim a lot of floor space for storage, and make the job of replacing the sagging bottom much easier.

The only issue I can think of is siphoning, but I don't know why it would happen in that configuration and not the way it is now. Anyway, opinions?
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