The 11mm valve is a very common deflate valve used for many years on many kites as the main deflate valve. If your kite has a 9mm inflation valve, chances are it has an 11m deflate valve.
From the leaders in kite repair technology, Fixmykite.com's Self-Stick Valves will stick on all bladders. Simply peel and stick to make a fast and easy repair on an old bladder or attach to a brand new bladder. The specially formulated adhesive is incredibly durable making for a permanent repair. Everything needed for installing the new valve is included in the package: alcohol wipe and detailed instructions.
The "Valve Patch Size" option is to select the size of the Tear-Aid patch the valve is attached to. Standard valves have a 3-inch diameter and the Mega patches have a 4-inch. This extra inch on the Mega means 77% more adhesive base and surface area compared to the standard valve patch size. The Mega patch is necessary when the old valve is cut from the bladder or the bladder is torn or warped when the old valve is removed. The additional surface area provided by the Mega valve patch allows quick and easy bladder repair, eliminating the need for an additional bladder.