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  1. #1
    Join Date
    Aug 2008

    Default Dishwasher drain to Disposer connection

    I am installing a dishwasher and garbage disposal in a kitchen where there were none before. Standard instructions say to create a high loop with dishwasher drain hose and connect it to the dishwasher drain port on the disposal (after removing knock out). A plumber I spoke to said to bi-pass the disposal port an attach the dishwasher drain hose behind (downstream of) the disposer to avoid noise and potential clogs. I've heard that if a disposer is present, you must by code, attach DW drain to it. Is this true? Is there a good reason to drain the DW into the disposal, or can I by-pass the disposer input with no issues?
    Additionally, the disposer drain fitting is a pvc elbow which requires a loop or small "trap" be created before horizontally teeing into the vertical drain in front of the main trap. I was told I can remove this elbow and go straight to the tee. Is this true?
    Last edited by Foster; 08-23-2008 at 10:41 AM.

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