Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number FSP16566 found under Seal Mechanical by Pentair Pump Group Inc. The National Stock Number assigned to this part is 5330010263096, and the Federal Supply Class is 5330 Packing And Gasket Materials. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like FSP16566.