SQUARE TO ROUND COMPATIBLE DESIGN This exhaust hose coupler features a round end on one side and a square end on the other, allowing easy installation on the back of many portable air conditioner models. Designed to fit all 5.9inch hoses, it provides a secure connection for a wide range of units without the need for complex modifications. ENHANCED COOLING PERFORMANCE By attaching the exhaust hose firmly to your air conditioning unit, this coupler reduces air leakage and improves overall cooling efficiency. The tight fit helps your portable AC cool rooms faster, making it ideal for use at home, in the garage, or in office settings. Its flexible and extendable design makes it easy to position in tight or irregular spaces. RAPID HEAT REMOVAL AND QUIET OPERATION This connector helps channel warm air out of the room more efficiently, supporting quicker temperature reduction. Engineered for low wind noise, it operates quietly without disturbing daily activities or rest, making it a practical choice for spaces where noise control matters. DURABLE ABS CONSTRUCTION Built from quality ABS material, the coupler combines lightweight design with strong durability. The material's heat resistance provides dependable support under regular use, while the rigid yet slightly flexible structure ensures a lasting fit and performance over time. PRACTICAL USE SCENARIOS Connecting your portable air conditioner to an exhaust hose in the living room for efficient cooling during summer. Removing warm air from a garage workspace while maintaining a quiet environment. Cooling a home office quickly by ensuring an airtight seal between the AC unit and exhaust hose. FUNCTIONS AND COMPATIBILITY Fits all 5.9inch diameter hoses. Suitable for a wide range of portable air conditioner models with roundtosquare fittings. Offers a quick, secure installation without additional tools. This coupler provides a reliable solution for attaching an exhaust hose to your portable AC unit, delivering improved cooling efficiency, faster heat removal, and quiet operation in any environment.