Wratten filter is a combination of two filters cut to size and calibrated; reusable, disposable; to detect particles in fuel samples
NSN 5999-01-423-9876
NSN 5985-00-724-4897
NSN 5990-01-161-4625
NSN 6240-01-165-2693
NSN 6620-01-443-3526
NSN 6240-01-258-5829
NSN 5920-01-129-9724
NSN 6620-00-035-5813
NSN 6135-01-598-9889
NSN 6110-00-976-3361
NSN 5855-01-605-2438
NSN 2925-01-491-7318