My 1951 house double kitchen sink drains well through the disposal (right) sink, but backs up in the drain of the left-hand sink. There are no obstructions in the under-the-sink plastic drains & trap. I had a guy roto the inside-the-wall drain down to the main line out to the sewer, with lots of sludge removed but no improvement in drainage from the left hand sink. He said my vent stack is probably plugged and, sure enough, when I ran a garden hose into it from the roof, it filled up with water. So I'm going to get another guy to roto that. All the other drains in the house work fine.
Question 1: Why don't roof vents have rain caps or screens to keep out leaves and debris?
Question 2: If one half the double sink doesn't need the vent to drain, why does the other?
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