[100% Sealing Effect] Compared with the old-fashioned zipper design, this new design portable air conditioner window vent kit adopts external anti-mosquito round interface design, which ensures excellent 100% sealing effect, and it can perfectly fit the hose interface, firmly block heat and keep the rain out, with of 300cm available, [Universal Compatibility] portable AC window seal with a maximum perimeter of 300 CM(three sides of the window), Suitable for that bottom hung or skylights, casement window(except sliding ). Not only for portable mobile air conditioners, but also for dryers, exhaust dryers and dehumidifiers, you can enjoy a cool and comfortable summer no matter what type of air conditioning unit you use. [Easy to Install] No drilling or tools required, it's a breeze to install and very simple! 1. Wipe the window frame clean (no water damage) 2. Stick the sticky side of the Nylon Sticker on the window frame 3. Stick the window seal along the Nylon Sticker 4. Connect the exhaust pipe to the round connector 5. Connect with the interface of the sealing cloth. [Quality Materials] Window sealing cloth is made of nano polyester material with double stitching technology to enhance sealing, waterproof and heat insulation. Nylon Sticker is thickened to 2cm to enhance adhesion, high temperature resistance, no residue for disassembly. External round connector with skeletonized design. [Package and Service ]: This Window Seal for Portable Air Conditioner includes 1 x 300cm Window Sealing Cloth, 1 x non-marking backed Nylon Sticker, 1 x external round connector. Colour:White Material:Plastic+cloth Package Contents: 1 * windshield 1 * flat mouth interface 1 * Nylon Sticker 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.