Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4E21097-101A found under Pan Portable Oxygen by Texstars Llc. The National Stock Number assigned to this part is 1560004432364, and the Federal Supply Class is 1560 Airframe Structural Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 4E21097-101A.