Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4C5-4RFSX found under Adapter Straight Tube To Hose by Enertec America Inc. The National Stock Number assigned to this part is 4730009958254, 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 4C5-4RFSX.