The Stardupp SUP valve is a replacement valve for the Sup boards from Stardupp & Fit Ocean.
Over time and due to everyday wear and tear it is possible that a valve will leak. It is then very important to replace the valve as the pressure loss of your board is at the expense of SUP pleasure.
You can replace a valve by loosening the old valve with a SUP valve key. Then screw in the new valve.
As extra security, a rubber ring can be placed between the valve and the SUP. See: STARDUPP RUBBER RING FOR VALVE / VALVE