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
9 Review
Pentek 10 Standard Housing Pressure
10 Review
π§ Pentek 150467 Blue Housing Pressure: Optimal Solution for Filtering Water
Pentek R30 20BB Pleated Polyester Cartridge
7 Review
π§ Bostitch BTFP72326 4" Thread Regulator
8 Review
πΏ Maximize Air Quality with the Aprilaire 201 Replacement Filter Purifier
Milton 1108 Duo Filter Regulator
3 Review
π ARO C38341 600 VS Air Filter Regulator Lubricator Combo