The 3" & 4" Dorade Cowl Vent Screen is crafted from flexible, bendable plastic for a snug fit on curved or uneven surfaces, perfect for marine and RV applications. Its durable design holds up in harsh outdoor environments, while the built-in fiberglass mesh keeps insects, debris, and splash water out—maintaining clean, efficient airflow. Compact for tight spaces like cabins or engine compartments, this vent screen offers essential ventilation without taking up extra room. Easy to install with no tools required, it's ideal for boats, yachts, trailers, and outdoor buildings.