I would say this is a good mag in one piece. sealing part is at the bottom. I like this design, but if they can change part #47 in anti-clockwise to fit in part #51(in-take valve), the sealing is even better. that's why I suggest you don't tighten the in-take valve by itself. if you do it, part51 is un-tightened, then you'll never fix the leak, even worst.
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