What's the difference between a Vent Tee and a Waste Tee?

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El Dorado

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I need to lower (6 inches) the drain pipe under my kitchen sink because it is to high to accomodate my batch feed disposal. I went to the store to pick up some fittings, but wasn't sure which tee to get, so I got both. Does it matter which one I use?
 

Terry

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If you are lowering the kitchen drain, and the drain is vertical, you would use a Sanitary Tee.
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Sanitary Tee

A Santary Tee Wye would not be used in the vertical position for venting. It would create an "S" trap in that position.
 
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