Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4B-1FC-4 found under Adapter Straight Pi by Tylok International Inc. The National Stock Number assigned to this part is 4730007221371, 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 4B-1FC-4.