Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number BT 1 4IN 20MESH found under Strainer Sediment by Spirax Sarco Inc. The National Stock Number assigned to this part is 4730013389705, 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 BT 1 4IN 20MESH.