Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 41-1505 found under Bellows Unit Pump by Sargent Welch Scientific Co. The National Stock Number assigned to this part is 4310000762369, 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 41-1505.