Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B-3-1-18 found under Atomizer Cleaning Base Assembly by Todd Shipyards Corp. The National Stock Number assigned to this part is 4530009535067, 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 B-3-1-18.