Hi Chris,
Your Hoover SteamVac model F5842 needs the Hoover SteamVac replacement hose part number 40309007. You may find a link to the correct hose for your model below on our website:
Hoover SteamVac F5842 Replacement Hose AssemblyIn terms of replacing the hose, this is an older style SteamVac, which attaches the hose to the front of the Dirty Water Solution Tank.
Here is are instructions on how to attach the hose to your machine:
http://www.fixya.com/support/t4699742-dont_manual_u_connect_hoseHopefully this was helpful, and answered your question. Please don't hesitate to request a clarification, or add a comment if you have any further questions or concerns.
Thanks,
Chris Jones
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