Replace Kite valve when you have to cut it out cutout

How to replace faulty kite valve when they have to be cut out. This Fone valve was cracking at the hose connection. But any kite valve that is not peeling off can be fixed this same way.
Fixmykite.com

[@AborigenAborigenovich]

I advise you to glue the adhesive films not vertically over the entire area at once. Place the patch with one edge to the mark at an angle to the surface and gradually begin to lower the patch, decreasing the angle. Sticking will occur gradually. As if rolling. This will give you more control to avoid wrinkles and bubbles.

[@interferenz2k3]

Wondering if the plastic disc inside will not damage or cut the bladder while rolling / folding your kite.

[@kiteboardingcom1]

It will NOT do any damage.