I think I modified mine like Michael Did. I followed one I saw in our bee group. It has a space for the bees to come up from the center and drink from the side but they can't get into the top. Bees would still fly into the top when I was filling it etc. I put a screen on top. It keeps that from happening. No bees drowned since these modifications. The hive top feeder holds alot of syrup which is nice. I feed with inverted mason jars mainly though. Here's a pic of my hive top feeder after I tried to make it drown proof.