The primary inclosure containing a drying agent such as silica gel or activated alumina.
NSN 5990-01-138-8981
NSN 6240-01-321-5168
NSN 6320-01-252-1531
NSN 5855-00-149-0766
NSN 6220-01-435-8851
NSN 5945-01-519-8887
NSN 5835-01-399-5820
NSN 5999-01-622-0683
NSN 5990-00-161-2797
NSN 6610-00-542-6307
NSN 6135-01-328-0639
NSN 5855-00-494-9581