Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 300-403-2 found under Body Breathing Apparatus by Biomarine Ntron Incorporated. The National Stock Number assigned to this part is 4220009397967, and the Federal Supply Class is 4220 Marine Lifesaving And Diving Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 300-403-2.