Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 520-01-08R01 found under Breathing Tube Assembly by Racal Health And Safety Inc. The National Stock Number assigned to this part is 4240012440112, 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 520-01-08R01.