Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 19504 found under Guide Poppet Valve by Alliedsignal Inc. The National Stock Number assigned to this part is 2935003081273, and the Federal Supply Class is 2935 Engine System Cooling Components Aircraft Prime Moving. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 19504.