The model K200 is a new model in 2005. It has almost double the volume of the Model 100 and is designed to be the best pump for “topping off” you have ever seen. There simply are no equal... This is a “must” pump for all rafts, cata-rafts and pontoon crafts because you can stand upright when using it. The stroking action is effortless, yet highly efficient. There is simply no comparable pump that will produce as much air volume with less effort. Commercial river guides acclaim this pump to be about as valuable as their floatation jackets. If you have a back problem, this is “your” pump! A quick demonstration at a K-Pump dealer will quickly prove its value.