1. Introduction
This manual provides instructions for the proper use and maintenance of your Shop-Vac Genuine Vacuum Filter, Model 90304 / Type U. This cartridge filter is designed for both wet and dry pick-up applications, offering robust performance for various cleaning challenges.
Compatibility: This filter fits most Shop-Vac wet/dry Vacs. It is important to note that this filter does not fit 1x1, BullDog Portable, Mighty Mini, Hippo, Hang Up Vacs, or AllAround Series models.
2. Safety Information
- Always disconnect the vacuum cleaner from the power source before installing, removing, or cleaning the filter.
- Ensure the filter is correctly seated and secured before operating the vacuum to prevent damage to the motor or reduced performance.
- Do not use a damaged or torn filter. Replace it immediately.
- Keep filters out of reach of children.
3. Setup and Installation
Follow these steps to install the Shop-Vac Genuine Vacuum Filter into your compatible wet/dry vacuum:
- Ensure the vacuum cleaner is unplugged from the electrical outlet.
- Remove the power head from the collection tank.
- If replacing an old filter, carefully remove it and dispose of it properly.
- Slide the new cartridge filter over the filter cage on the motor housing. Ensure the rubber gasket on the filter creates a tight seal against the base of the power head.
- Secure the filter in place according to your specific vacuum model's instructions (e.g., using a filter nut or retainer).
- Replace the power head onto the collection tank and secure the latches.

Image 1: The Shop-Vac Genuine Vacuum Filter 90304 / Type U. This image displays the cylindrical filter with pleated paper and black rubber end caps, ready for installation.
4. Operating Considerations
The Shop-Vac Genuine Vacuum Filter is designed to capture small, dry debris and can also be used for wet material pickup. When performing wet pickup, ensure the filter is properly installed for wet operation as per your vacuum's specific instructions. For optimal performance, avoid switching directly between wet and dry pickup without allowing the filter to dry or replacing it, as a wet filter used for dry debris can clog quickly.
5. Maintenance
While this filter is classified as disposable, it can often be cleaned to extend its lifespan before replacement. Regular maintenance ensures consistent vacuum performance.
Cleaning the Filter
For dry debris, gently tap the filter against the inside of a trash receptacle to dislodge accumulated dust and dirt. For wet debris, or if the filter is heavily soiled, it can be rinsed:
- Remove the filter from the vacuum.
- Rinse the filter under running water (e.g., a garden hose or faucet) until the water runs clear.
- Allow the filter to air dry completely before reinstalling it in the vacuum. Do not use the vacuum with a wet filter for dry pickup, as this can damage the filter and reduce suction.

Image 2: A Shop-Vac filter covered in debris after use. This illustrates the filter's function in collecting various materials.

Image 3: A hand rinsing the Shop-Vac filter under a stream of water from a hose. This demonstrates a method for cleaning the filter to extend its life.
Filter Replacement
Despite cleaning, filters will eventually degrade and lose efficiency. Replace the filter when you notice a significant decrease in suction power, visible damage to the filter material, or if it cannot be cleaned effectively. Regular replacement ensures optimal vacuum performance and motor longevity.

Image 4: A hand disposing of a used Shop-Vac filter into a trash bin. This illustrates the final step in the filter's lifecycle when it needs to be replaced.
6. Troubleshooting
- Reduced Suction: Check if the filter is clogged with debris. Clean or replace the filter. Ensure the filter is properly seated and sealed.
- Dust Escaping: Verify the filter is correctly installed and not damaged. A damaged filter will allow dust to escape. Replace if damaged.
- Difficulty Installing: Ensure you have the correct filter model (90304 / Type U) for your Shop-Vac. Refer to your vacuum's manual for specific installation steps.
7. Specifications
- Model Number: 9030433
- Product Dimensions: 7.75"L x 7.75"W x 8"H
- Weight: Approximately 1.1 Pounds
- Reusability: Disposable (can be rinsed for extended life)
- Number of Pieces: 1
- Compatible Devices: Most Shop-Vac Vacuum Cleaners (excluding specific models listed in Introduction)
- Manufacturer: Shop-Vac USA
8. Warranty and Support
For information regarding product warranty or technical support, please refer to the documentation provided with your Shop-Vac vacuum cleaner or contact Shop-Vac customer service directly. Contact details can typically be found on the official Shop-Vac website or on your vacuum cleaner's user manual.