[davepl]

Yep, that's what I'm hearing. I still need to reverse it to have it in the "factory correct" orientation anyway.

I guess I'm saying "Prove it works backwards", but it's not really that important.

I figure unless someone has actually tried it, there's a chance it forces it shut when you try to flow backwards through it. If not, though, it's likely connected to the wrong port of the vacuum switch, and I'll go through the diagrams. Can't hurt to have both the water and vacuum plumbing "right" anyway.