External wall vent cover compatible with dryer with 4in diameter

4in Dryer Vent Cover Outdoor Wall With Cushioned Non Return Flap,external Extractor Wall Vent,stainless Steel Vent Cover [Function] 4 Inch metal dryer vent cover design compatible with use with dryer vent hose. Durable, Rust & Weather Proof function, Suitable compatible with residential housing and industrial facilities use [High Quality] The vent covers compatible with home are made of high-quality 304 stainless steel, With Durable, Weather & Rust Proof functions. The vent cover flap could prevent birds, cold air, rain from entering [Multi ] Our dryer vent cover outdoor is compatible with dryer vent hose or metal duct. Perfect compatible with bathrooms, campers, garages, kitchen, sheds, RV etc. Suitable compatible with room exhaust and ventilation use [Easy to Install] Step 1. Select the proper location according to the hose size . . Measure & mark the screw location compatible with the vent. Step 3. Drill the Hole. Step 4. Install the screws and insert the duct Please note:the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Colour:Silver Material:Stainless steel Size:4In Package Contents: 1 * dryer vent cover 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.