Fill the pail and ensure it is completely sealed all the way around. Invert the pail (yep, turn it upside down) away from the hive and let it drip a little bit until it stops. This should adequately determine if you have a nice vacuum seal. Place the inverted feeder pail with the lid screen over the hole in the inner cover and surround with an empty deep hive body (2 empty medium supers work also) and place your telescopic cover over it.
Robbers can not get at the syrup. Holds approx 1 gallon of syrup.