Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HADB 1028-81 found under Parts Kit Regulator Breathing Ga by Air Liquide Advanced Technologies. The National Stock Number assigned to this part is 4240014409640, 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 HADB 1028-81.