Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 99K4B-U PC 159F found under Shim Set by Pentair Pump Group Inc. The National Stock Number assigned to this part is 5365010770082, and the Federal Supply Class is 5365 Bushings Rings Shims And Spacers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 99K4B-U PC 159F.