i bought some 3- vent covers..i knew i should probubly not have but i thought id take a chance..they barely lasted a year on top of my rv before they broke down from the uv's from the sun..they basically turned into small wafer like peices that looked like crakers..the worst plastic junk ive ever seen,,and they were 40$ each not to mention installation..whats my time worth?..i will never go to crappy tire ever again as long as i live..tired of the junk they sell..this was the quesnel crappy tire in bc..i wrote a review on these vent covers on thier website and they never published it