Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 522-02-03R03 found under Hood Respirator by Racal Health And Safety Inc. The National Stock Number assigned to this part is 4240014183003, and the Federal Supply Class is 4240 Safety And Rescue Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 522-02-03R03.