Quote Originally Posted by mas985
Could you use something like item 34-215 on this page:

http://www.recreonics.com/fyi/wall_fittings.htm

Also, the 3-way Jandy valves do have the ability to position such that both lines are on.
Probably can't use that. It would have to fit a vinyl lined pool in a retro-fit application. That looks like it will only fit a new installation since its a solvent welded application.

The question on the Jandy is not that it would open both ports, but would it open both ports fully and create no significant restriction. Two ball valves would create essentially no restriction, but its two parts and the valves are not as reliable from what I've read.