This is the triple threat pump! The 2 added cylinders will allow you to pump faster and easier. This pump also allows you to utilize single or double action features. When in single action, air is pushed when pumping on the down stroke. When the double action switch is engaged you can pump on the up and down stroke. This feature allows for extra volume to be put into your board, and then when pumping get harder, simply switch the lever and feel the ease of the single action. With a built-in gauge, the maximum pressure is 1.9 bar or 27 psi. This is the BEST hand pump for inflatable products on the market! Three-year warranty