Outerwear Pre-Filter, 3.5 Round, 4 Tall, Black

OVERVIEW

When you''re pushing your air-cooled VW through the punishing environments of the Mojave or just cruising down a dusty backroad, your engine''s biggest enemy isn''t heatit''s ingestion. The Outerwears Pre-Filter, specifically designed with a 3.5-inch diameter and 4-inch height, serves as your first line of defense against the elements that want to ruin your valvetrain and cylinder walls. This isn''t just a simple mesh cover; it is a precision-engineered barrier crafted from a proprietary polyester mesh. By utilizing uniform micron openings, this pre-filter stops dirt, sand, and large debris down to .005 inches before they ever reach your primary air filter. This significantly extends the life of your expensive pleated or foam main filter, ensuring that your Weber, Dellorto, or Solex carburetors receive the cleanest air possible without sacrificing the high-volume airflow required for peak performance.

Beyond its debris-blocking capabilities, this black Outerwears pre-filter features a specialized hydrophobic water-repellent treatment. For the off-road enthusiast running a dune buggy, woods buggy, or a Baja Bug, this is a game-changer. It allows you to navigate damp conditions and light splashes without the fear of your main filter "soaking up" water and choking out your engine. The UV-resistant material ensures that the deep black finish won''t fade or degrade under the intense sun, maintaining both its structural integrity and its sleek appearance. Whether you are running a Weber progressive setup or a custom velocity stack, adding an Outerwear is the smartest insurance policy you can buy for your high-performance air-cooled power plant. It reduces maintenance intervals, saves you money on replacement filters, and provides the peace of mind that your intake is protected by the best in the industry.

FITMENT

This 3.5-inch round by 4-inch tall pre-filter is designed for a variety of performance air filter applications commonly found on air-cooled Volkswagens and off-road vehicles. While it is a universal-fit component based on dimensions, it is frequently used on the following:

• VW Beetle (Type 1): 1946-1979 models equipped with aftermarket 3.5" diameter round performance air cleaners.
• VW Karmann Ghia: 1956-1974 models utilizing upgraded carburetor setups like Weber or Dellorto.
• VW Bus (Type 2): 1950-1979 models, particularly those with upright conversions or performance dual-carb kits.
• VW Thing (Type 181): 1973-1974 models frequently exposed to off-road dust and debris.
• Dune Buggies & Sand Rails: Any custom build utilizing a 3.5" round pod-style filter or velocity stack.
• Carburetor Compatibility: Fits many filters associated with Weber Progressive (DGV/DFEV), Weber IDF, and Dellorto DRLA series air cleaners that match the 3.5" x 4" profile.

SPECS

• Manufacturer: Outerwears
• Part Number: 115-4TBK
• Shape: Round / Cylindrical
• Diameter: 3.5 Inches
• Height: 4.0 Inches
• Color: Black
• Material: Proprietary UV-Resistant Polyester Mesh
• Filtration Rating: Deflects debris down to .005"
• Special Treatment: Hydrophobic (Water Repellent) process
• Construction: Uniform micron openings for maximum airflow with minimum restriction

PRO TIPS

1. The Proper Cleaning Technique

Never use harsh degreasers, gasoline, or pressurized air to clean your Outerwears pre-filter. Doing so can break down the proprietary hydrophobic coating and distort the uniform micron openings. Instead, simply remove the pre-filter and wash it in a bucket of warm water mixed with a mild dish soap. Gently agitate the material by hand, rinse thoroughly with cool water, and let it air dry completely before re-installing. This ensures the water-repellent properties remain intact and the mesh continues to breathe at its maximum potential.

2. Maximize Airflow with a Snug Fit

When installing the pre-filter over your primary filter element, ensure there are no large folds or "bunched up" areas of mesh. While the material is designed to be breathable, excessive overlapping of the mesh can create localized restriction. Ensure the elastic base (if applicable) or the seating area is secure so that air cannot bypass the pre-filter. A properly seated Outerwear should look like a "second skin" over your filter, providing 360-degree protection without interfering with the intake velocity.

3. Monitoring Hydrophobic Performance

The water-repellent coating is incredibly durable, but it isn''t permanent. If you notice that water is no longer "beading" off the surface of the mesh during cleaning or in damp conditions, it may be time to replace the unit. In high-exposure environments like sand dunes or muddy trails, the abrasive nature of the debris will eventually wear down the treatment. We recommend replacing your Outerwears every 1-2 seasons depending on your mileage and environment to ensure your engine remains fully protected from moisture ingestion.