Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MS21912J4 found under Tee Tube by Society Of Automotive Engineers Inc. The National Stock Number assigned to this part is 4730009398634, 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 MS21912J4.