Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MS939N1 found under Seal Rotary Mechani by Pentair Pump Group Inc. The National Stock Number assigned to this part is 5330004957266, 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 MS939N1.