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Fits standard 100mm ducting – Compatible with 100mm rigid duct pipes and flexible hose commonly used with bathroom and kitchen extractor fans. Secure straight duct connection – 100mm (4”) coupler joins two round ducts together, creating a firm, aligned, and airtight connection for ventilation systems. Smooth internal airflow path – Straight-through design helps maintain consistent airflow with minimal resistance. Quick and easy installation – Push-fit coupler installs quickly between ducts and can be secured with tape or hose clamps for a neat finish. Durable PVC plastic build – Made from lightweight, moisture-resistant ABS plastic designed for long-term use in domestic ventilation systems.