[UPGRADE DESIGN]This latest window vent kit was designed with 2 in 1 coupler, inner buckle fits 5.1 inch diameter exhaust hose (for clockwise or counterclockwise), and the external buckle fits 5.9 inch diameter exhaust hose (only for counterclockwise). [GOOD SEALING]This generation III upgrades the sliding rail interlocking construction. The plate can be perfectly embedded into the window rail to achieve a tightly sealing effect, keep the indoor temperature comfortable and cool, and energy saving. [WIDE COMPATIBILITY] Our window sealing kit is suitable for most vertical and horizontal sliding . It consists of 4 plates, with an adjustable range from 17 inch to 61 inch, to meet the needs of different sliding door heights. [EASY TO INSTALL]Our portable AC window kit is made of PVC material, which does not deteriorate easily. No tools are required, easy to install and remove, and can be used repeatedly. Specifications Material: PVC colour: white Package Contents: 4 x Window Seal Plates 4