Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number P20-0552 found under Adapter Coupling Mu by Gleason Corp. The National Stock Number assigned to this part is 2990003788633, and the Federal Supply Class is 2990 Miscellaneous Engine Accessories Nonaircraft. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like P20-0552.