I'm thinking of putting my feeder outside, so it would have to be reasonably waterproof....and I have seen feeders with stoppers to close to keep out rodents. I'm more concerned with the reviews that say their chickens get "stuck" in some of them.
I've been researching the various automatic (PVC) feeders for chickens, and so many people complain about their chickens ripping out feathers, the feed gets wet, the chickens crawl inside and die.....which one is the best for most flocks of adult chickens?