Tecman,

The deepest diffuser should have the valve open all the way. Use the remaining two valves to even the "Boil" size for all three. The shallowest run would require the least amount of pressure.

Again, having different type of diffusers on the same line may take some time to even out the flow.

Cary Martin
http://i36.photobucket.com/albums/e4/martincv123/fishfight.gif[/IMG]