Thanks, Ed.
I'm looking for 2" (or 2-1/2") dia. fittings, ones that just need one "dial" to switch between two ports.
The Wye branch needs to close one gate and open another to effect the change of ports. It is similar to what I was thinking of fabricating, using a Y-connector with two 2-1/2" blast gates (for about $20 Cdn in total costs), but decided against it.