Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 377 03399 004 found under Parts Kit Seal Replacement Mecha by York International Corporation. The National Stock Number assigned to this part is 5330016614147, 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 377 03399 004.