plumber jeff
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That is a johnson tee dishwasher drain. http://www.askmehelpdesk.com/attachment ... 1277248929 I recommend them on all houses i plumb where the ks and dw is on a exterior wall. make sure that the 3/4 pvc cap on the outside of the house has a hole drilled in it to work as a vent. During testing of the dwv system that cap is glued on. most i see even on old houses they are not drilled. http://www.terrylove.com/images/johnson_tee_2.jpg