Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 491223 found under Cap Filler Opening by Syltone Industries Llc. The National Stock Number assigned to this part is 4730004999695, 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 491223.