Epic/RRD/Peter Lynn one pump valve. Valve is 15mm high plus has 90 degree bend and fits through a hole in the leading edge of 19mm.
This is the valve only. We use these in our repair centre to repair kite bladders, they don't come pre-prepared so only suit experienced repairs and other repair centres. We have made an instructional video showing a technique we developed over many years to fit these here-
They can also just be glued on using Aquasure glue also available in our shop.
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