[Confirm Outlet Diameter]Our sliding AC vent kit exhaust coupler is approximately 5.1 inch diameter. Before purchasing, please you make that the diameter of the AC Air Intake Outlet and Air Exhaust Outlet of your portable air conditioner is 5.1inch. [High Quality Material]Our portable AC window kit made of high quality PVC material, anti-extrusion, anti-aging, can let you enjoy every summer cool. Suitable for sliding vertical / horizontal windows. [Easy Set-up]the window vent kit is suitable for most vertical and horizontal sliding windows. You can choose to use 2 panels, 3 panels or 4 panels according to the length of the window, which is suitable for windows with a length of 17 inches-61 inches. Great for most in the market. Material: PVC+ABS colour: as shown Package Contents: 2 x outer plates 2 x inner plates 1 x exhaust pipe adapter 2 x sealing tapes 5 x butterfly screws 1 x insect screen Only the above package content, other products are not included. Note: Light reflection 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.