garabage disposals backing up o
Posted by mark tremblay on September 16, 2002 at 17:32:34:
my friend installed a garbage disposal and has a vent ,and a p trap on each side of sink but still backs up does each side of the sink have to have a seperate line to the drain or can they both share the same drain line after the traps? if this is ok what are some other ideas

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