Upper Left Photo: A resourceful design using readily available materials. These buckets can be picked up at almost any department or hardware store. A general consensus is that bait tanks that are round in shape are better than those with any corners in them. Also in the photo is the priming bulb connected to the 3/8 inch hose.
Upper Right Photo: The top of the tank. I'm not sure exactly how this was made, but it looks like you could take the top off another bait bucket and cut/blend it to the top of the lid.
Lower Photo: This is the discharge for the tank made out of 1 1/2 inch tubing.
Photo's courtesy of Billbeau.