The 15l Feeder should be placed on the top of the hive. It is easy to feed the bees wintering syrup. Just pour syrup from a bucket or pump it into the feeder. We have added 5l, 10l, 15l marks on the side of the Feeder to understand how many liters you have poured into the Feeder. Plexiglas ensures that bees will not drown in syrup.