vacuum

Hey all, I have a couple vacuum breaker sizing issues that I need to sort out. I'm not a professional plumber and I've been asked to explain sizing issues with vacuum breakers in specific situations (this is a weird one, I know). All the information they gave me is this: 'Provide a few sizing...

The title pretty much says it all. I've got a bathroom sink that wouldn't drain. After working on it for a bit I realized it's connected to a double kitchen sink on the other side of the wall. I've suck 'em both with the wet/dry vac, I've plugged and plunged 'til I was blue in the face (and...