Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number S12RB4 found under Bushing Pipe by Swagelok Ltd. The National Stock Number assigned to this part is 4730011276274, 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 S12RB4.