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By far the most common configuration is the baffle tee (possibly code required). I wonder if perhaps the disposal is not doing its job well enough? I do like the suggestion of a wye combo or adding the immediate elbow so that more water pressure goes toward the baffle (and run it with water when you use the disposal). Some other suggestions I ran into ...


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Many garburator a do NOT have the screw underneath. I fixed mine that way but my neighbour had a Waste King (you have to free blades from top with wooden spoon or broom handle). I used a ball of silly putty to get the small pieces and freed the blades then pushed reset


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I don't think there's a code imposed minimum, but there's likely a physical limitation based on available fittings. Between the disposal outlet and the drain, there must be a trap. The bottom of the disposal outlet, must be above the trap weir (the point in the trap at which water starts to drain from the trap). Therefore, in theory the bottom of the ...


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I'm not aware of a code requirement other than that the connection would have to take place above the trap seal (the portion of the trap that holds water). Therefore installing a sanitary tee on top of the p-trap would be acceptable. There is a maximum developed length of 1200mm (3'-11") for the fixture outlet pipe (from sink or disposal to p-trap). Note: ...


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Your math looks good, but you haven't accounted for the tail-piece from the disposal into the trap. The 7 3/16" you calculated is to the center line of the disposal's outlet, and there's a piece attached that fits into the trap. In the linked diagram, that tail piece is shown as 4" high, so in the worst case, measuring from the bottom of the countertop down, ...



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