Notice: This article or section contains information about content that was planned or conceptualized for the Epic Mickey series, but was ultimately scrapped. Information about scrapped content should not be considered canon.
The Jug Pump is a scrapped, special version of the Jug (which was originally supposed to be extremely big, perhaps more than half the size of Mickeyjunk Mountain). Both the Giant Jug and the Mountain were supposed to be on the seaside of the Thinner Ocean, another scrapped item which was exactly what his name describes: a large ocean of thinner separating the different Lands of the Wasteland.
After having trapped the Blot (still named the Phantom Blot in these concepts), Oswald was about to have made a plan: dragging all the Thinner of the Wasteland inside of the Jug, using various pumps. The largest one, directly next to the Jug, was supposed to suck the entire Thinner Ocean into the Jug. Sadly, the mechanism was broken at some point, and it was a quest to repair it with paint. Ursula (or an alternate version of her) was supposed to live in the Jug in these early concepts, and as she was probably living in the ocean before the Thinner Disaster, it is very likely that she's been sucked from the thinner ocean to the inside of the jug by the Pump before it stopped to work, and was then trapped inside because of the pump being out of order.
A sketch of the Jug.
The Jug towers over what looks to be like people.
A scrapped scene where Lifters snatch Toons foolish enough to be near the Jug Pump.