Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4A11861B16 found under Ring Wearing by Grundfos Cbs Inc. The National Stock Number assigned to this part is 4320000637430, and the Federal Supply Class is 4320 Power And Hand Pumps. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 4A11861B16.