Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HI-OX-80-FIO2-OXYGEN-MASK found under by Viasys Respiratory Care Inc. The National Stock Number assigned to this part is 6515015056024, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like HI-OX-80-FIO2-OXYGEN-MASK.