Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 891B1-4 found under Strainer Sediment by Henry Technologies Inc. The National Stock Number assigned to this part is 4730004695429, 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 891B1-4.