He might be talking about this valve.
53380
Why so he is. I took his word that the valve info desired had vanished from the site, on account of the original pdf link now takes you to a more generic Toro irrigation page, and once you click to valves, you see only jar-tops and that midget 3/4-inch valve, so I figured it must be a one-inch valve like a 250 series that was being looked for.
I'll edit my post above. I think the only thing like an exploded view of the midget valve will come by way of a complete parts breakdown of the entire Toro Res/Com line.