Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HY3-306V4 found under Filter Fluid by Kaydon Corporation. The National Stock Number assigned to this part is 4330011047251, and the Federal Supply Class is 4330 Centrifugals Separators And Pressure And Vacuum Filters. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like HY3-306V4.