[Size]5.1inches is compatible with the portable air conditioner with 5.1 inches inner diameter exhaust hose / 5.9 inches is compatible with the portable air conditioner with 5.9 inches inner diameter exhaust hose. NOTE: Please measure your hose size before purchasing. [Universal Clockwise Counterclockwise Threaded Design] Our AC vent hose coupler is speccially designed to support both clockwise counterclockwise threaded. You never need to worry about installing it in a wrong direction. [Durable material]Made with hardend plastic, so it is durable and strong enough to protect your AC hose connection. Isolate the exhaust air away from your room. [Extend Your Exhaust Hose Anywhere]This AC hose coupler is convenient to extend the exhaust hose to you want. Enjoy the coldness in the hot summer. Colour: light grey Material:plastic Size:150mm / 130mm<br><br>Package Contents: 1 * Connector<br><br>Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.