Breather Filter Sock 3in Dia. and 2-1/2in Tall

The Breather Filter Sock 3in Dia. and 2-1/2in Tall by Specialty Products Company is a compact air filtration wrap designed for engine breather systems, crankcase ventilation lines, and PCV (positive crankcase ventilation) applications. As an experienced mechanic, you know that engine breather systems require protection from atmospheric contaminants while allowing pressure relief—and this cotton filter sock delivers exactly that. Whether you're building a high-performance engine, restoring a classic vehicle, or upgrading a modified engine's breathing system, this 3-inch diameter breather filter prevents dirt, moisture, and debris from entering the crankcase while maintaining adequate airflow.

Constructed from cotton material, this breather filter sock offers superior filtration efficiency compared to foam alternatives, with a proven ability to trap fine particulates while resisting oil saturation that can restrict flow. The 3-inch diameter and 2.5-inch height are engineered to fit standard breather ports found on most small-block and mid-sized engine builds, providing a compact form factor that integrates cleanly into engine bay layouts without bulk or awkward plumbing. The black cotton wrap design is washable and reusable, making it a cost-effective long-term solution for street, strip, and show vehicles alike. Its lightweight construction (0.05 lbs) ensures negligible impact on engine components while the tight weave prevents oil carryover into intake systems.

This breather filter sock is ideal for engine builders, hot-rod enthusiasts, and mechanics upgrading carbureted or fuel-injected engines with aftermarket heads, cam packages, or increased displacement that generate elevated crankcase pressure. It works seamlessly with custom breather manifolds, braided hoses, and valve cover vent systems common in performance builds. Regular inspection and cleaning every 10,000–15,000 miles maintains peak filtration; simply remove and rinse with solvent, then dry before reinstalling. Compatibility spans domestic and import platforms with standard 3-inch breather ports, making this an essential component for any serious engine modification project.