Big Horn 4 in. x 2-1/2 in. Quick Coupler makes setting up your dust collection system simple and efficient. Designed to connect seamlessly, one end of the coupler threads into a 2-1/2" ID dust collection hose, while the other end press-fits securely onto a 4" OD dust collection fitting. This ensures a tight, reliable connection that helps maintain optimal airflow and dust control during your woodworking or workshop tasks. Its sturdy construction and easy installation make it an essential accessory for anyone looking to improve their dust collection setup with minimal hassle. Model Number: