Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 21242 found under Boot Dust And Moist by Crane Pumps And Systems Inc. The National Stock Number assigned to this part is 5930005792041, and the Federal Supply Class is 5930 Switches. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 21242.