Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1621 found under Gravel Water Filter by Culligan Intl Co. The National Stock Number assigned to this part is 5610013557784, and the Federal Supply Class is 5610 Mineral Construction Materials Bulk. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 1621.