Your stand up paddle has air leaking at the valve 

In the case if the air valve is leaking at the edge, it is possible that the valve is not tightened enough, please follow the step below. 

At the first time, please note the valve composition. 

Step -1 If your SUP has an air leaking around the valve , we will recommend you to strongly tighten the upper valve with the supplied wrench in the clockwise direction. 

Step -2 If the air leaking persists, we will recommend you to unscrew the upper valve in the counterclockwise direction. 

Step -3 Remove the upper valve and make sure that the bottom valve is centered to the structure board hole, If this is not the case, please adjust it by hand, then perform the same steps in the reverse order to screw and tighten valve again.