Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number UPB-4UB found under Switch Subassembly by Rose Electronics. The National Stock Number assigned to this part is 5930016586503, 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 UPB-4UB.