For those of you looking for the OEM part to "replace" the existing hose with a 15' long ext hose here is the part no: 43434042.
Hoover Site: EXTRA HOSE ASM COMP 43434042
From Ristenbatt.com
"
Extend the reach of your Hoover WindTunnel upright with this extra long wire-reinforced stretch hose. Its great for stairs and reaching into areas where you vacuum can't go. The machine end is 1 1/2" in diameter with two locking pins which hold it in the vacuum. Its attachment end is extra large to fit over the Hoover WindTunnel wands and attachments like the on-board hose does. This hose provides a 20' total attachment reach. (Hose stretched to about 15' plus two wands and the crevice tool.) This genuine Hoover hose is used instead of their on-board hose on most WindTunnel uprights that use paper bags and Hoover Bagless WindTunnel Self-Propelled uprights manufactured November 2002 or later."