Originally Posted by Dave_Monica
Another thought...you should be able to remove the Hepvo valve (threaded both ends?) and see why it's not functioning. Perhaps something caught in it.
Yeah, just a lot of disassembly of the 'basement walls' to get at it. I'd never seen a Hepvo valve before, and I'm wondering if they fail a lot. My question regarding the shared p-trap is because I've never seen a shared one except for a double sink. If I'm pulling it all apart, I just wondered if modifying it to take a p-trap would be smarter...