The primary inclosure containing a drying agent such as silica gel or activated alumina.
NSN 6650-00-056-1581
NSN 5975-01-304-8530
NSN 6320-01-373-9355
NSN 5895-01-029-9535
NSN 5915-01-328-7525
NSN 5999-01-254-6691
NSN 5965-01-600-8137
NSN 5920-01-044-5621
NSN 6240-01-142-0729
NSN 5915-00-045-6986
NSN 5996-01-442-0832
NSN 6620-00-663-8962