This 4 pint feeder is designed so that it can be filled without disturbing the hive.
205mm diameter, 90mm high, these can be used on top of WBC bee hives, National hives, 6 frame hives and inside top bar hives.
There is no risk of leakage and associated robbing problems.
It is known as a rapid feeder, sometimes called the Miller design or an up and over feeder.
Food grade plastic construction. This is the brand used by beekeepers worldwide.