Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number P11550 found under Spring Helical Comp by Siemens Water Technologies Corp. The National Stock Number assigned to this part is 5360004242734, and the Federal Supply Class is 5360 Coil Flat Leaf And Wire Springs. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like P11550.