PERFECT valves that ...
1> doesnt let the water escape into the air side.
1> doesnt let the air escape into the water side.
2> dont required any energy to open and close
3> dont restrict the speed of the 'ball' in passing


Side question::
Does anyoneone know if permanent magnets (eg boron) are
reduced in their strength by being used...
eg: two equal boron magnets HELD north to north for an
extended period, and then are released.
Is thier strength (gauss rating?) still as strong as they were
in the beginning?
Has their 'strength' been diminished by being distorted for so long...