Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PL161774 NO 4A found under Seal Plain by Sun Star Electric Inc. The National Stock Number assigned to this part is 5330015003907, 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 PL161774 NO 4A.