then eye that what you posted has the intervention threshold at 0.2 bar, not 0.02, and are check valves (not return, "europa". not "depression." that is mounted "in line" on the conduct of the fluid, which "works in thrust". .
and would remain the problem when you load the tank (always if you dare to hold all the circuit closed, tin); That valve only works in one sense.
but at the discharge what is there, what do you put on, where does it end?
But don't you have a drill?
apart from jokes. .. why don't you try to explain better the motivations of certain choices, so we understand better?
One thing is to say "I want to put on a m6", another is to say "I want to put on a m6 because the warehouse bought five hundred kilos and now has to dispose". I don't know if I understand. .