EWIW
As I'm sure you know these are VHTF.
What I found years ago while hunting was that most of the "White" AC filers did not have an embossed nut.
The only one I've ever come across was what I've always referred to as a "Blue" service filter.
Cheers.
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When I die, I want to go peacefully like my grandfather did, in his sleep.
Not screaming like the passengers in his car.
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