Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4J12021-102B found under Seal Assy Elbow Sla by Yama Mfg Co Incorporated. The National Stock Number assigned to this part is 5330008577701, and the Federal Supply Class is 5330 Packing And Gasket Materials. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 4J12021-102B.