The Power Products 5" Rubber Reducing 5 To 4 90° Air Intake Elbow is designed to provide consistent performance in the real-world operating environment. The interior surface of the elbow is designed to be smooth, ensuring smooth airflow and minimizing turbulence. This elbow is designed for a perfect fit and easy installation and is made of black rubber for durability. With this elbow, you can be sure that your air intake system will be running smoothly and efficiently. FleetPride is your First Click in Heavy Duty®.