My kitchen sink has begun draining v-e-r-y slowly. I’ve cleaned the trap and found nothing. The dishwasher drains just fine, but of course the water is being pushed out by the internal pump. I’ve always understood that the drain needs an air vent in order to work properly. As Mike Holmes always says “need air behind water”.
In checking the PVC drain line I don’t see any vent. What I do see is a parallel PVC pipe that is connected at both end to my drain. Picture if you will a 20 foot run of PVC. Now picture a 10 foot piece of PVC next to it and tied in at both ends with several elbows. A closed loop.
Anyone have any idea what the hexk this is and if it is supposed to somehow help the draining process?