This feeder holds about 1L of syrup and goes inside your hive, sitting on top of the crown board and under the lid, so its perfect for flow hives. 

As its inside the hive there can be no problem with ants or robber bees stealing the syrup. The ladder style feeder enables the bees to climb down to access the syrup, making drowning less. for a video of this in use click here https://www.youtube.com/watch?v=0dCPvi0iCaQ