4 Pack Vacuum Cleaner HEPA Filters for Cyclonic Series RO3753EA RO3731EA RO3786EA 1. The hose connector is made of high-quality materials, which has a certain strength and tightness. The connector is flat and smooth as a whole, not easy to break, safe and durable, and will not scratch the surface of the installation object.2. Professional accessories: a connector used to connect the window sealing plate and the air-conditioning exhaust hose with a diameter of 13cm/15cm.3. Advantages: Good air conditioning hose sealing can help reduce energy consumption, and a well-structured exhaust ventilation system can save your electricity bill under an efficient cooling system.4. There are a variety of specifications to choose from, you can purchase the corresponding air conditioner hose adapter according to your needs.5. Convenient installation: There is a serrated bar in the connection port between the connector and the hose, which can perfectly fit the hose without scratching the hose. Just put the hose into the connector slowly and it can be used after installing. Notice:1.Actual color may be slightly different from the image due to different monitor and light effect2.Please allow 1-3cm deviation due to manual measurementMaterial: Reusable plasticSize: 13cm/15cm(Optional)includes:1 x Air Conditioner Exhaust Hose Adapter