From what I remember of my ASM I'm not sure I'd want it external. It could easily be made watertight, it pretty much is - you just have to mod the pump intake to draw from the skimmer body but then you also have to add a feed port. To this end those curved bulkheads are your friend but the base of the skimmer is kind of narrow so you'll need to stabilize it somehow, I did a recirc mod on mine when I had it and it was forever wobbly because the weight of the pump pulled it off balance.
Next off they're kind of a chintzy build quality, that's the reason they're affordable, there's less material in them. Doesn't take much to take them apart.
Might be easier to put it in a separate small tank that has flow from the sump somehow if it's just a matter of not enough space IN the sump for the skimmer.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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