Thank you for taking an interest in part number FLEX T4, that of which is a Du Pont E I De Nemours And Co Inc product listed with description "Test Pack Thyroxine Determination". In addition to being listed with part number FLEX T4, this particular offering also has the NSN 6550013278502, further allowing you to ensure that you only procure the exact aerospace parts you require for your operations. If you would like to begin procurement for your desired NSN parts or simply want to know more about this listing, be sure to fill out and submit the RFQ form provided below with as much information as possible.