I was thinking the same as it fits exactly in my AIO. But after installing it I realize it's better to have some wiggle room for adjustments. Having it fit "perfect" without extra room makes adjustments difficult. Also something might hinder water flow to the pump intake since space is so tight.I will keep this in mind as it fits perfectly in the AIO I ordered.
Also K1-nano is a magnetic mount which is easier to adjust, K1-50 is not. IMO being easy to make adjustment is pretty key for a skimmer to get it dialed in just right.
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