Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number U13987 found under Diaphragm Assembly by Siemens Water Technologies Corp. The National Stock Number assigned to this part is 4610005746294, and the Federal Supply Class is 4610 Water Purification Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like U13987.