Entrance or "boardman" feeder. While we don't recommend using a boardman feeder on the entrance of a hive, we do find they work very well inside top bar hives. The lid (included) fits most quart mason jars.
Simply fill the jar with the feed of your choice, screw on the lid, upturn it over the feeder and place the feeder on the floor of your top bar hive. It can be used on the same side of the follower board as the colony, but you'll want to watch it carefully and make sure they don't build comb around it. You can also cut a small hole in your divider and place the feeder on the other side. This way the bees can't build comb around it.
Entrance feeders fit nicely into the entrance of any Langstroth hive. However, we recommend a double jar feeder instead of an entrance feeder on a Langstroth, as they are less likely to incite robbing.