2011, they released the Thunderstorm, which used an electric pump to push water directly out the nozzle. In 2012, Super Soaker made two motorized water guns: The Lightningstorm, a reproduction of the Thunderstorm with added accessories, and the Electrostorm, a smaller motorized gun. Each required four AA batteries to run. CPS (Constant Pressure System) The Constant Pressure System is the most powerful system used by Super Soaker. The user pumps water from the reservoir into a rubber bladder, which expands as more water is forced into it. The stretched rubber exerts a constant pressure on the water, giving the blaster a thick and constant stream throughout the entire shot. In most older models, the resulting blast is forceful enough that recoil can be felt. Hasbro has implemented the Constant Pressure System in Super Soaker blasters a number of times since completing the takeover of Larami Corp in 2002. The most recent implementation was in the 2011 'Hydro Cannon', while the largest post-takeover pressure chamber (at 900ml) is found in the 2007 'HydroBlitz' blaster. Original series models of Super Soakers The following are the original models of Super Soaker guns: Super Soaker 10 Weighing in at less than 3 ounces, the SS10 was a sub-compact, pistol-type model that was easily concealable due to its small size (56 mL tank volume, model year 1993) Super Soaker 20 The SS20 was a pistol-type model which came with an either a rear-mounted or a grip-mounted pump. (115 mL tank volume, model year 1992) Super Soaker 25 Designed with the grip-mounted pump, the SS25 came with a belt and additional, surplus water tank. (177 mL tank volume, model year 1992) Super Soaker 30 The original pistol-sized gun, the SS30 was released with the very first models in 1991. While only slightly heavier than the SS20, it holds more than twice the water in its reservoir. (265 mL tank volume, model year 1991) Super Soaker 40 With a design similar to that of the classic SS50, the SS40 possessed somewhat more compact size dimensions. While it also came with a significantly smaller water reservoir, the SS40 was a later model of more durable construction and was touted on its accompanying packaging as "the most powerful watergun ever!" (490 mL tank volume, model year 1993) Super Soaker 50 The original mid-size weapon, the SS50 was a best-selling model. Known for its impressive range due its novel air