The air valve you see is used to pressurize the mini shock's IFP so that the rear wheel extends freely when it leaves the ground. At the moment it moves in either direction with little force.
Credit
Brandon Turman // Vital MTB
The air valve you see is used to pressurize the mini shock's IFP so that the rear wheel extends freely when it leaves the ground. At the moment it moves in either direction with little force.