Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 57R19A found under Strainer Element Se by Colt Industries Inc. The National Stock Number assigned to this part is 4730007539068, 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 57R19A.