Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B-5773SK ITEM 21 found under Packing Preformed by Galland Henning Nopak Inc. The National Stock Number assigned to this part is 5330012269505, 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 B-5773SK ITEM 21.