Mario, yes the ball valve system weighs more than a single solenoid valve but performance is many fold greater - so worth the weight. I have run many calculations optimising flowrate, buffer tanks and geometry and this set-up offers by far a better performance than two Burkerts but it is only theory. We will just have to wait and see what happens in practice. Did I mention it is also variable pressure, I can set the flipper pressure from 10 to 50 bar from the transmitter during the fight - so I get lots of M2 flips at lower pressures or a few Gravity style flips when I want them.