All my in-line filters use 1/4" quick disconnects. It's 1/2" FNPT. I've added pictures to show my fittings used. I would discard these filters as they have the wrong labels.
π§ The Ultimate Pentek Big Blue Housing NPT: Top-rated Choice for Exceptional Filtration
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NANPU Compressed Air Filter Regulator Combo: Brass Element, Semi-Auto Drain, 0-150 Psi Gauge, And More
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