Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MBB-A1C1E00-020 found under Detector Gas by Rae Corp. The National Stock Number assigned to this part is 6665015996704, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like MBB-A1C1E00-020.