Airlette BSA-2 Deluxe Snap-In Vent<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>No Hardware or adhesives required for installation.</li><li>Simple Snap-on installation (installs in seconds.)</li><li>Assured water-tight seal.</li><li>Self-adjusts to fit any flexible cover (up to 1/8" thickness)</li><li>Resilient， non-corrosive plastic... durable... light weight</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41XrJMBUiAL.jpg" noproxy>