Hoover Mach 5 and Mach 6 replacement secondary foam filter for bagless uprights that use Hoover foam filter # 93002518.
This currently includes but is not limited to Hoover models :
Mach 5 Cyclonic - U5194900
Mach 6 Bagless - U5198900
WindTunnel + Cyclonic - U5780900 U5781900 UH70035B
Mach Cyclonic Upright - UH70040
Pet Cyclonic Bagless Upright - UH70085
WindTunnel Pet Rewind Plus Bagless Upright - UH70086