ZVac. Replaces Part Numbers 4010100Y Fits: Hoover WindTunnel Upright Vacuum Cleaner Models U5491- 900, U5481-900, U5491-950, U5491900, U6439-900 This is a 18 package of premium generic replacement Vacuum Bags by ZVac. This replaces the original OEM Hoover Type Y Vacuum Bags &amp; replaces part numbers 4010100Y. Premium generic Vacuum Bags fits these series of Hoover vacuums: WindTunnel Upright Vacuum Cleaner Models U5491-900, U5481-900, U5491-950, U5491900 &amp; other vacuums using Type Y Vacuum Bags.. Fits these models: U5491-900, U5481-900, U5491-950, U5491900, U6439-900, C1705-900, C1703-900, CH50010, C1712, U5140-900, UH30015, U8188-900, UH30070, UH30030HD, UH30085, U5470-900, U5468-900, U5472-900, U5471-900. Also fits: U5473-900, U8172-900, U6485-900, U8181-900, U8174-900, U8187-900, U5458- 910, U5458-900, U5462-900, U5460-900, U5467-900, UH50000, UH40110, U6420-900, UH50005B, U6454-900. This is a premium generic product made by ZVac. This is not an OEM product and is not covered under any manufacturer&#39;s warranty. ZVac is not affiliated with the manufacturer.