Proper manual pumping technique uses the entire body. Initially, it will be easiest to pump using mainly your arms. As the pressure increases, you'll want to bend and extend your legs with each stroke to make use of your body weight and core muscles. Manual pumping can be tiring, so take regular breaks when needed. After inflation to 15 PSI, carefully disconnect the hose from the valve by grasping the hose end firmly and rotating it counterclockwise until the air pressure ejects it from the valve. The cap helps prevent air loss or accidental deflation and also protects the valve from debris.
CAUTION: When removing the hose from the board valve, grasp the hose end FIRMLY to prevent high velocity recoil of the hose, which can cause serious injury.
MAXIMUM AIR PRESSURE: The correct pressure for and ERS board is 15 PSI though it has been designed to handle pressure up to 17PSI though it makes only a little difference in rigidity. The pressure inside the board's air chamber increases with higher temperatures, so the PSI may rise above the starting pressure during use or transport which is why 15PSI is optimal. Likewise, the pressure inside the board may decline in colder weather. If the board becomes overinflated due to increasing ambient temperature or inflation error, push down on the valve stem to deflate until you reach the recommended pressure. If the board is underinflated, re-attach the pump and inflate until the desired PSI reading is attained.