Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PA4999 found under Coupling Half Quick by Acco Babcock Inc. The National Stock Number assigned to this part is 4730009796521, and the Federal Supply Class is 4730 Hose Pipe Tube Lubrication And Railing Fittings. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like PA4999.