A lot depends on the local plumbing code. There is a national code as well as your local state code. If this is a commerical application I believe that each basin has to have its own trap.answerThe "National Plumbing Code" is a MODEL code with a great name that has fooled a lot of people. (Kind of like Paris Hilton). Whether your state or municipality has adopted a code or not, this suggestion will work and pass about anywhere: On the inch-and-a-half pipe or nipple protruding from the wall install a "wye" with the branch aimed toward the far bowl, run the branch over to the p-trap on the tailpiece coming down from the strainer. Done on that side. On the straight run through the barrel of the wye, head toward the bowl on the near side. Get a "disposal kit" from the BIG BOX selling all the imported stuff. That's a straight piece of inch-and-a-half tubular with a flange on one end, and a "tee" with an internal baffle. Install the baffle tee on the vertical line between the p-trap and strainer on that second bowl, pointing it straight at the disposal outlet. The flanged piece runs from the disposal outlet to the branch of the baffle tee.
The disposal has to be in place so that the drain on the dishwasher is connected. If you do not have a disposal or are removing it, there is a extension tube for the drain that has the dishwasher tube in it. The disposal does not have to work for the dishwasher to drain. The water is run through the disposal so that any food particles get ground before going in the drain. After a while, the disposal will begin to smell if it is not run.
If the sink/sink drain fitting connection, sink drain fitting/disposal connection, dishwasher/disposal connection, disposal/drain elbow connection are what are leaking they can either be tightened or have gaskets replaced or other sealing methods used. If the disposal is leaking elsewhere the disposal needs replacement.
If you have a septic tank or gray water system in your home then do not install a garbage disposal because it has been know to clog up your drain field. If you have city sewer and have a garbage disposal then I would recommend that when using the garbage disposal, you make sure you are running cold water because it helps make vegi's not stick to the sides of your drain and its cheaper and I forget but something to do with spaghetti and disposals don't mix.
If it is a double sink, does the other side drain? Are you trying to fix the disposal because it does not come on or because it comes on but does not drain. If it comes on but does not drain and the other side does, it is probably just clogged with food. They make drain cleaners for disposals. If neither side drains, put the stopper in the disposal side, hold down on it and plunge the other side.
A disposal creates centrifugal force and acts as a pump. Often a blocked or partially blocked sink drain can result in slow drains and a disposal will force water through. If it really is the disposal, try slowly adding coffee grounds and/or fibrous material like broccoli centers or pineapple centers while cold water and the disposal are running. If that doesn't solve the problem, have the drain cleaned and make certain that the drain vent works.
Your kitchen sink should already be vented if there is a p-trap draining to the wall. if it is an s-trap it is not vented and not to present code requirements. The dishwasher drain goes into the side of the disposal and the disposal should drain to the trap. A separate vent is not required for the disposal or dishwasher as the trap for the sink is what requires a vent.
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