4into1 Uni Filter UP-102 Clamp-On Breather 3/8" Barb — Polyurethane Foam, Washable High-Efficiency Vent

The 4into1 Uni Filter UP-102 3/8" Clamp-On Breather is a clamp-on polyurethane-foam breather that traps dirt and moisture to protect your ATV or small-engine intake while allowing reliable airflow.

The Uni Filter UP-102 is a clamp-style breather designed for ATVs, pit bikes, small motorcycles, and other outdoor machines that operate in dusty, muddy conditions. Built around open-cell polyurethane foam and specially formulated filter oil, this breather captures contaminants before they enter your engine or crankcase vent. It’s compact, simple to install on a 3/8" barb, and engineered to be more effective than many paper vent elements according to independent testing.

How does the UP-102 keep dirt and moisture out?

The Uni Filter UP-102 uses multiple layers of open-cell foam coated with sticky, purpose-made oil. Particles and droplets impact the foam, stick to the oiled surface, and are held there rather than being drawn into the engine or vent system.

• Open-cell polyurethane foam increases surface area for trapping particulates.
• Special filter oil improves particle adhesion and water separation.
• Clamp-on design fits a 3/8" hose barb for secure mounting.

Will it fit my machine and how easy is installation?

The UP-102 clamps onto a standard 3/8" breather or vent fitting, so installation is quick and tool-light on most machines. Slide the breather over the hose barb, tighten the clamp, and it’s ready to function; no special adapters are normally required.

• 3/8" clamp-on barb fits many crankcase and vent hoses.
• Simple clamp mechanism allows fast replacement in the field.
• Compact footprint works in tight engine bays or behind bodywork.

How does it compare to paper filters and what maintenance does it need?

Independent lab testing shows Uni breather filters capture more contaminants than many paper-style vent elements. Because foam filters are washable and re-oilable, they can be refreshed repeatedly rather than replaced each service interval.

• Laboratory-proven higher efficiency versus paper elements for breather use.
• Wash with a mild solvent or soapy water, let dry, then reapply filter oil.
• Periodic visual checks and re-oiling restore performance after heavy use.

Who is this for? The 4into1 Uni Filter UP-102 is ideal for riders and mechanics who need a compact, durable breather for ATVs, UTVs, pit bikes, go-karts, snowmobiles, and other small engines exposed to dust, mud, or water spray. It suits users who prefer maintainable, high-efficiency foam elements over disposable paper vent fittings and who want a simple clamp-on installation that’s easy to service in the field.