Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number D3B20U found under Bushing Sleeve by Pentair Pump Group Inc. The National Stock Number assigned to this part is 3120001113272, and the Federal Supply Class is 3120 Bearings Plain Unmounted. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like D3B20U.