P-Trap offset for new sink installation

Old 07-24-00, 02:49 AM
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Our new kitchen sink is a side-by-side model. It sits lower in the cabinet than its predecessor (a single). The 2 drain pipes will drop to a 90 union, to horizontal pipes, T-joined to a 2nd drop, then it will be joined to a new P-Trap. The critical questions are...
1-how long should the initial drops be
between the sink and the horizontal
joining pipe ?
2-how much lower should the P-trap be than
the start of the 2nd drop?

note: the existing venting and main drain will be used.
Old 07-24-00, 08:34 AM
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None of those measurements are critical that you ask about. Usually in cramped conditions I use a four inch tailpieces but I have cut them shorter than that and I use a four inch tailpiece out of the tee into the p-trap and I have also cut that shorter too. If one bowl in your new sink is deeper than the other remember water will seek its own level so leave the tailpieces longer under the bowls so water will not back up into either the bowls when they drain. So shorten the tail piece into the p-trap to compensate.

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