Product Overview
The Hoover 3-120171 is a long-life, pleated replacement cartridge filter designed for use in various Dirt Devil wet/dry vacuum cleaner models, specifically 08800, 08900/b, and 081600/b. This filter is engineered to function effectively in both wet and dry pickup applications, eliminating the need to change filters or tanks when switching between wet and dry vacuuming tasks.
- Designed for both wet and dry vacuuming.
- Features a pleated design for extended life.
- Manufactured in China.
- Easy to install and highly durable.
Installation Instructions
Follow these steps to properly install the Hoover 3-120171 Wet/Dry Cartridge Filter into your compatible Dirt Devil wet/dry vacuum cleaner.
- Power Off and Unplug: Before beginning, ensure your wet/dry vacuum cleaner is turned off and unplugged from the power outlet to prevent accidental startup.
- Access the Filter Compartment: Unlatch and remove the motor head assembly from the vacuum's collection tank. Depending on your model, the filter may be located directly under the motor head or within a separate filter cage.
- Remove Old Filter: Carefully remove the existing filter. If it is a cartridge filter, it may twist off or pull directly from a central post. Dispose of the old filter responsibly.
- Install New Filter: Place the new Hoover 3-120171 cartridge filter onto the filter cage or central post. Ensure it is seated firmly and correctly. The pleated side should face outwards.
- Secure Motor Head: Reattach the motor head assembly to the collection tank, ensuring all latches are securely fastened.
- Test Operation: Plug in the vacuum and perform a brief test to ensure proper function and suction.

Image: The Hoover 3-120171 Wet/Dry Cartridge Filter, showing its pleated design and approximate dimensions (8.2 inches / 20 cm in height).
Operating the Filter
The Hoover 3-120171 filter is designed for versatile use in both wet and dry vacuuming applications. Once installed, it allows for seamless transitions between collecting dry debris and wet spills without the need to swap out the filter. Its pleated construction is engineered for efficient filtration in both environments.
Maintenance
To ensure optimal performance and longevity of your vacuum cleaner, regular inspection and timely replacement of the filter are recommended.
- Inspection: Periodically check the filter for visible signs of wear, tears, or excessive clogging.
- Replacement: While this filter is designed for long life, its effectiveness will diminish over time with heavy use. Replace the filter when you notice a decrease in suction power, or if the filter appears heavily soiled and cannot be cleaned effectively.
- Cleaning: For light dust accumulation, gently tap the filter against a hard surface to dislodge debris. Avoid washing the filter with water unless specifically instructed by the vacuum cleaner's manual, as this can damage the pleated material and reduce filtration efficiency.
Troubleshooting
If you experience issues with your vacuum cleaner after installing the new filter, consider the following:
- Reduced Suction: Ensure the filter is correctly seated and the motor head is securely latched. A loose filter or improperly sealed motor head can lead to air leaks and reduced suction.
- Dust Escaping: Verify that the filter is not damaged and is installed correctly. A damaged or improperly installed filter may allow dust to escape back into the air.
- Water Leakage (Wet Pickup): Confirm the filter is designed for wet pickup (which the 3-120171 is). Ensure all seals on the vacuum are intact and the filter is properly installed to prevent water from reaching the motor.
Specifications
| Feature | Detail |
|---|---|
| Part Number | 3-120171 |
| Item Weight | 1.5 pounds |
| Product Dimensions | 8.75 x 8 x 7.5 inches |
| Item Model Number | 3-120171 |
| Item Package Quantity | 1 |
| Number Of Pieces | 1 |
| Manufacturer | HOOVER INC/TTI FLOOR CARE |
| ASIN | B0015OL1Z8 |
| Date First Available | January 1, 2008 |
Warranty Information
This Hoover 3-120171 Wet/Dry Cartridge Filter comes with a 2-year manufacturer's warranty. For specific terms and conditions, please refer to the documentation provided with your original vacuum cleaner or contact Hoover customer support.
Support and Contact
For further assistance, technical support, or inquiries regarding your Hoover 3-120171 Wet/Dry Cartridge Filter, please contact Hoover customer service. You can typically find contact information on the official Hoover website or within your vacuum cleaner's original user manual.
Online Resources: www.hoover.com





