Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number U19811 found under Gage by Siemens Water Technologies Corp. The National Stock Number assigned to this part is 5210011326235, and the Federal Supply Class is 5210 Measuring Tools Craftsmens. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like U19811.