Hoover 38765019 and 38765023 secondary vacuum cleaner filter. 
Also known as Type F105 and AH41001. 
Fits most WindTunnel self-propelled models. 
This filter fits inside the Hoover WindTunnel bag chamber. 
Genuine Hoover secondary vacuum filter. 
This filter fits but is not limited to the following Hoover upright vacuum models: 
C1701900, C1703900, C1705900 
U5140900, U5145900, U5146900, U5148900, U5150900, U5155900, U5156900 
U53019RM, U53029RM, U5348911 
U5402900, U5409955, U5416900, U54219RM, U5435906, U5436950, U5438960, U5453900, U5458900, U5458910, U5460900, U5462900, U5467900, U5468900, U5470900, U5473900, U5481980, U5491900, U5491950 
U64019RM, U6420900, U6434900, U6436900, U6445906, U6454900, U6471900, U6476900, U6476910 
UH30015, UH30030HD, UH50000 
Anniversary WindTunnel Self-Propelled - U6485900, U6485900PC