All my inline 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 on them.
Filter under the sink Aquaphor Crystal Eco
62 Review
Filter under the sink Aquaphor Crystal A, 1/2" white
51 Review
Hydronix CB 45 2001 Commercial Industrial Activated π§ Water Filter: The Ultimate Solution for Efficient Water Purification
7 Review
Pentek R30 20BB Pleated Polyester Cartridge
7 Review
NANPU 1 FRL Air Filter Regulator Lubricator Combo With 0-150 Psi Gauge, 5 Micron Brass Element, Poly Bowl & Semi-Auto Drain - Metal Bracket Included
20 Review
NANPU 3/8" NPT Compressed Air Filter Regulator Combo Piggyback, 5 Micron Brass Element, Poly Bowl, Semi-Auto Drain, Metal Bracket, 0-150 Psi Gauge
26 Review
π§ NANPU 1/2" NPT Compressed Air Filter Regulator Combo Piggyback with Auto Drain, 5 Micron Brass Element, Poly Bowl, Metal Bracket, and 0-150 psi Gauge
18 Review
NANPU 1/2" NPT Air Drying System - 5 Micron Particulate Filter, 0.01 Micron Coalescing Filter, Air Pressure Regulator Combo - Semi-Auto Drain, Poly Bowl W/Metal Gauge
23 Review