User-friendly design: universal model, suitable for all portable air conditioners with 5.9" diameter hose. Innovative ways:PVC clamping rail can be installed on all types of sliding windows both vertically and horizontally and can therefore be used variably. Flexible use:6.3 "Width telescoping sealing rails, the seal size of the rail can be variably adjusted between 18" and 48 " Quality Assurance: durable PVC material, low weight can be easily attached and removed and stored space-saving when not in use. Energy saving and reliable: The window seal for mobile air conditioning systems with exhaust air hose prevents the ingress of hot air and thus increases the efficiency of the device.