Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 11521 found under Disk Gate Valve by Flowserve Corporation. The National Stock Number assigned to this part is 3655003775014, and the Federal Supply Class is 3655 Gas Generating And Dispensing Systems Fixed Or Mobile. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 11521.