Hi Peeps,
The flap is only to prevent the air from escaping when you pull out the large bore connection from the pump. It is not designed to be air tight. The rubber seal within the cap that you screw in place after you remove the valve is the seal to prevent air leakage.
These can leak air if you do no maintenance on your kite. This is exactly the same as the Ozone and many other screw on caps. If you never clean the sand from the rubber seal, don't be surprised if you have a leak from the cap.
Simple: Every once in a while if you have a problem, remove the black seal, clean it, and re-install it. That's it!
DM
There's a whacking great plastic cap with a rubber seal there for a reason. Blow the pump into it to blow any sand out and you're golden. Same concept as Liquid force/Core etc. This is the same company that sticks rubber seals onto their pumps to get an airtight seal. They like to over engineer everything so not saying it couldn't be a lot better or simpler.
) on the Cabrinha older style one-pump valves (the ones that had the detachable connector for the hose). Maybe, Cabrinha ones worked because the "flap" is thinner and so bends and contours itself better over the valve outlet?
