Deflecto Universal Bird Guard， Fits 3" to 4" Vents， White (UBGWL)</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>Easily installs over any 3" or 4" clothes dryer or bathroom exhaust vent</li><li>Helps prevent birds form nesting in vents and rodents from entering through vents</li><li>Strong plastic construction for durability that provides maximum exhaust flow</li><li>Check periodically and remove lint or other debris， if present</li></ul></div></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br><img src='http://ecx.images-amazon.com/images/I/414jv0ku09L.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/61MjR7HcheL.jpg' noproxy></br>