That is one of those Chinese made Pest off feeders, not a Rat Proof Feeder. Rats can use them by jumping up once the feeder has the metal port clogging. Or they just chew through the plastic. But the most common problem is birds raking feed out on the ground which is likely why you have rats.
I'd put a game camera or watch the amount of feed per bird. Should be around 1/4 pound per adult bird per day. Something is keeping the rats around and it is always food.
I'd put a game camera or watch the amount of feed per bird. Should be around 1/4 pound per adult bird per day. Something is keeping the rats around and it is always food.