Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4091-1-3 8B found under Manifold by Republic Mfg Co. The National Stock Number assigned to this part is 1430010649702, 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 4091-1-3 8B.