I like having a nut on it because the filter sits on my bike and it's difficult to tighten by hand so I use a nut to tighten it. Wrenches, but I'm not crazy about them. I pretty much lower it by hand and then turn it 1/4 turn with a wrench. It also makes it super easy to remove the filter, assuming you didn't run into it with a 200-pound gorilla when you screwed the filter on.
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