Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4165-00 found under Pump Block Subassem by Pentair Filtration Inc. The National Stock Number assigned to this part is 4310011349324, and the Federal Supply Class is 4310 Compressors And Vacuum Pumps. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 4165-00.