Introduction
This manual provides instructions for the proper installation and maintenance of your FILTERWEARS Pre-Filter K119L. This pre-filter is specifically designed to protect your K&N Air Filter 59-2040 from debris and water, thereby extending its service life and reducing the frequency of required maintenance.
The FILTERWEARS K119L is a closed-top, round tapered pre-filter constructed from 100% monofilament polyester, featuring a water-repellent finish. It is manufactured in the USA.
Product Features
- Enhanced Filter Protection: Effectively shields your main air filter from dirt, dust, and water, preventing particles larger than 0.005 inches from reaching it.
- Extended Service Intervals: Contributes to a reduction in the frequency of cleaning and maintenance required for your primary air filter.
- Durable Material: Constructed from 100% monofilament polyester with a hydrophobic (water-repellent) finish for reliable performance.
- Temperature Resistant: Maintains full functionality in freezing temperatures and is capable of withstanding heat up to 450 degrees Fahrenheit.
- Easy Installation: Equipped with integrated straps at the base for convenient and secure attachment to the main air filter.
Specifications
| Model Number | K119L |
| Compatible Air Filter | K&N Air Filter 59-2040 (Compares to K&N 22-2040) |
| Material | 100% Monofilament Polyester |
| Finish | Water Repellent (Hydrophobic) |
| Design | Closed Top, Round Tapered |
| Dimensions (Approximate) | 4.5" Top Diameter, 3.0" Bottom Diameter, 4.0" Height |
| Item Weight | 2 ounces |
Installation Instructions
Follow these steps to properly install your FILTERWEARS Pre-Filter K119L onto your compatible K&N Air Filter 59-2040.
- Prepare the Main Filter: Ensure your K&N Air Filter 59-2040 is clean and dry before installing the pre-filter.
- Orient the Pre-Filter: Identify the top and bottom openings of the FILTERWEARS K119L. The wider opening (approximately 4.5" diameter) is the top, and the narrower opening (approximately 3.0" diameter) is the bottom.
- Slide On: Carefully slide the pre-filter over your K&N air filter, starting from the top. Ensure the pre-filter fully covers the exposed surface of the main filter.
- Secure with Straps: The pre-filter is equipped with straps at its base. Gently pull these straps to snug the pre-filter around the base of your main air filter, ensuring a secure fit. Avoid overtightening.
- Verify Fitment: Once installed, visually inspect that the pre-filter is evenly distributed and securely in place, with no loose areas that could allow debris to bypass it.


Maintenance
Regular maintenance of your FILTERWEARS Pre-Filter K119L will ensure optimal performance and continued protection for your main air filter.
- Inspection: Periodically inspect the pre-filter for signs of excessive dirt accumulation, debris, or any physical damage. The frequency of inspection should be adjusted based on your operating environment and conditions.
- Cleaning: When the pre-filter appears dirty, carefully remove it from the main air filter. It can be cleaned by gently shaking off loose debris, rinsing with water, or washing with a mild detergent. Allow the pre-filter to air dry completely before reinstallation. Do not use harsh chemicals, abrasive brushes, or machine wash.
- Replacement: If the pre-filter becomes torn, develops holes, or shows signs of significant wear or damage that compromises its protective function, it should be replaced promptly to maintain effective filtration.
Note: The pre-filter's water-repellent properties are inherent to the fabric and do not require re-treatment after washing.
Troubleshooting
This section addresses common issues you might encounter with your FILTERWEARS Pre-Filter K119L and provides potential solutions.
| Problem | Possible Cause | Solution |
|---|---|---|
| Pre-filter does not fit securely. | Incorrect orientation or not fully seated on the main filter. | Ensure the pre-filter is fully slid over the main filter and the base straps are snugged. Verify compatibility with K&N Air Filter 59-2040. |
| Main filter still appears to be getting dirty quickly. | Pre-filter is damaged, improperly installed, or operating in extremely harsh conditions. | Inspect the pre-filter for tears or holes. Re-install correctly, ensuring a tight fit. Consider more frequent cleaning or replacement of the pre-filter in severe environments. |
| Pre-filter appears wet on the surface after rain or washing. | This is a normal function of the water-repellent fabric. | The fabric is designed to repel water, not absorb it. While the surface may appear wet, it should prevent water from reaching the main filter. Allow to air dry naturally. |
Support Information
For further assistance or inquiries regarding your FILTERWEARS Pre-Filter K119L, please contact FILTERWEARS customer support.
You can typically find current contact information on the official FILTERWEARS website or through the retailer where the product was purchased.
When contacting support, please have your product model (K119L) and any relevant purchase details available to facilitate a quicker resolution.