The AMX-109 Kapool (colloquially referred to as "Ball" by both sides) is a mobile suit introduced in ∀ Gundam.
The Kapool's appearance was nearly identical to the AMX-109 Capule from the Dark History. However, it was smaller in size, and capable of operating in space as well. Though it was designed for amphibious combat, and can transform into a cruise mode in water, the Militia was unaware of this, and mostly used it for ground combat. Its cockpit was fitted with a First Neo Zeon War-era linear seat, but it did not have a panoramic monitor.
As the war with the Moonrace begins in CC 2345 on Earth's North Ameria continent, Inglessa ruler Guin Sard Lineford directs miner Sid Munzer to search the Mountain Cycle region for mobile suits. His search yields the AMX-109 Kapool, which becomes the first mobile suit used in mass numbers by the Inglessa Militia. Though the Kapool's ammunition is no match for advanced Moonrace mobile suits like the Wodom, it is extremely effective against smaller mobile suits like the MRC-U11D WaD. Later, as the Willgem travels across the ocean in its journey to the Moon, pilot Sochie Heim discovers that the Kapool is actually designed for underwater combat.