Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number BPF 1-1-4 found under Button Plug by Caplugs Ltd. The National Stock Number assigned to this part is 5340010522146, and the Federal Supply Class is 5340 Hardware Commercial. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like BPF 1-1-4.