Review on ⚙️ RVGUARD RV Water Heater Vent Cover: Stainless Steel Mesh Screen to Shield from Flying Insects - Includes Installation Tool and Silicone Rubber by Eric Jefferson

Repels large insects. I attach with soft aluminum or copper wire and pliers. Small spring things are too difficult to attach. Place the wire where you want it, so the ends are sticking straight out, and then through the screen as you feed it to the hole. Twist and bend the twisted wire as it passes through the screen so it doesn't snag on clothing as you walk past it. Much easier and more reliable than Lille spring clamps which sometimes come loose.