Manually pump in half the time! With the extra chamber it gives you more volume with each pump stroke, and less effort at the top PSI because the second chamber is smaller (you need less force to add the pressure)
Triple action transitions you from 1) both chambers on the up and down stroke, 2) both chambers only on the down stroke 3) small chamber only on the down stroke.
The handles and feet twist off for compact transport.
Awesome if you have multiple boards to inflate and want to cut some of the work.
*Cannot be swapped out for the one in a ULF kit, sorry!*