Outerwear Pre-Filter, 6 Round, 3.5 Tall, Blue

OVERVIEW

When you are tearing through the dunes or navigating silt-choked trails, your air-cooled engine is fighting a constant battle against airborne contaminants. The Outerwears Pre-Filter is the ultimate first line of defense for your high-performance air intake system. Engineered specifically for the harsh environments that VW sand rails, Baja Bugs, and off-road racers call home, this pre-filter utilizes a proprietary uniform micron-rated polyester mesh. Unlike standard foam or paper filters that can quickly clog or allow fine particles to pass through, this blue pre-filter is designed to deflect sand, dirt, and even water splashes before they ever reach your primary filter element. By stopping the heavy debris at the surface, you maintain consistent airflow and prevent the "suffocation" effect that often leads to power loss during a long day in the dirt.

Beyond its superior filtration capabilities, the Outerwears pre-filter is a cost-effective insurance policy for your engine''s longevity. Maintaining a clean primary filter on a Weber or Dellorto carburetor setup can be a chore, but with this pre-filter installed, you significantly extend the service intervals of your main element. The silicone-treated material is hydrophobic, meaning it helps repel moisture and prevents "mudding up" when conditions get damp. This 6-inch round, 3.5-inch tall unit is finished in a vibrant blue that not only looks great in a show-quality engine bay but also makes it easy to spot when it needs a quick cleaning. Whether you are running a single progressive carb or a custom velocity stack setup, don''t leave your internal components vulnerable to the abrasive nature of the off-road world.

FITMENT

This pre-filter is designed to fit 6-inch diameter round air filters with a 3.5-inch height. While universal in nature for filters of this size, it is most commonly found on the following air-cooled applications:

• VW Beetle (Type 1): All years equipped with aftermarket 6-inch round air cleaners.
• VW Bus (Type 2): 1950-1979 models running upright or pancake engines with round performance filters.
• VW Karmann Ghia: 1956-1974 with Weber or EMPI round filter assemblies.
• VW Thing (Type 181): 1973-1974 off-road configurations.
• Sand Rails & Dune Buggies: Custom builds using 6x3.5 inch round filter elements.
• Carburetor Compatibility: Fits many filters used on Weber 32/36 DGV, 38 DGAS, and various 2-barrel progressive carburetors.

SPECS

• Product Brand: Outerwears
• Shape: Round
• Diameter: 6.00 Inches
• Height: 3.50 Inches
• Color: Blue
• Material: UV-Resistant Silicone-Treated Polyester Mesh
• Filtration Rating: Deflects particles down to .005 inches
• Water Repellent: Yes (Hydrophobic technology)
• Part Number: 1875-35TBL
• Country of Origin: USA

PRO TIPS

1. Proper Cleaning Technique

To maintain the hydrophobic properties and airflow efficiency of your Outerwears pre-filter, never use pressurized air or harsh solvents like brake cleaner to clean it. Instead, remove the pre-filter and wash it in a bucket of warm water mixed with a mild dish soap. Gently agitate the material to release trapped dust and sand. Rinse it thoroughly from the inside out and let it air dry completely before re-installing. Applying harsh chemicals can strip the silicone treatment, reducing its ability to repel water and fine silt.

2. Ensure a Proper Seal

When installing the pre-filter over your primary air cleaner, make sure the elastic or drawstring base is seated firmly against the bottom plate of the air filter housing. If there is a gap between the pre-filter and the metal base, dust will find its way underneath and bypass the pre-filter entirely. For extreme silt conditions, some builders use a small amount of grease or a zip tie at the base to ensure an airtight seal against the filter cage, ensuring 100% of the air is processed through the Outerwears mesh.

3. Monitoring for Wear and Tear

While Outerwears are incredibly durable, they are a wear item in the world of off-road racing. Periodically inspect the mesh for any snags, small holes, or thinning of the material caused by vibration against the filter cage. Even a tiny pinhole can allow high-velocity sand particles to reach your primary filter and eventually your piston rings. If you see any daylight through a puncture, it is time to replace the unit. Keeping a spare blue pre-filter in your tool bag is a smart move for multi-day trips to the dunes or long-distance trail rides.