The double action pump with its twist cap is designed to easily inflate your board. This double action pump allows air to be pumped both on the upstroke (1.8 liters) and the downstroke (1.8 liters).
Once the pressure of about 5-7 psi is reached, simply remove the twist cap and finish inflating more easily by pumping air on the downstroke. (1.8 liters) The maximum pressure of the double action manual pump can reach 26 psi.