Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B13-3943-1AP found under Piping Cone Seal As by Acme Products And Engineering Inc. The National Stock Number assigned to this part is 4710011967828, and the Federal Supply Class is 4710 Pipe Tube And Rigid Tubing. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like B13-3943-1AP.