Drain question back to back Kitchen and bath sinks

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samiller06

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First time I'm using this forum... I am doing a remodel with approximately back to back kitchen and lavatory sinks. The 2" drain and vent pipe is offset with a 2"x2"x2" sanitary tee to attach the 2" horizontal drain line to. I am considering attaching a 2"x 1 1/2" x 1 1/2" sanitary tee with a 1 1/2" 45 street elbow toward the kitchen sink and then a 1 1/2" 90 long sweep to the lav sink. I have been through the code book but still I am not sure if I can do this or not according to code. I attached a picture (top view) to try to show what I want to do. The position of beams in the crawlspace drive me to propose this solution. Any advice would be greatly appreciated.

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Tuttles Revenge

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No, that is not the correct orientation for back to back sink drains. Basically you're draining the kitchen through the trap arm of the bathroom sink.

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