Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 83868 found under Valve Breathing Apparatus by Mine Safety Appliances Company. The National Stock Number assigned to this part is 4240000218300, 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 83868.