Our easy-to-use Dual Action Hand Pump with gauge easily and quickly inflates your standup paddle board with very little effort. With a slip of the switch, you can move from dual-action pumping to single-action pumping swiftly. When you initially fill the board, use the dual-action option (high volume, low pressure). When it becomes more difficult to pump, switch over to the single-action option to finish pumping. With a built-in gauge, the maximum pressure is 1.9 bar or 27 psi. The smaller silver tube adds efficiency and air volume while pumping which creates an easier and more enjoyable pumping experience!