Tubeless Valve Kit (2 x 55mm Presta)

not fit for purpose IMHO; the curved washer to sit snug onto a round rim might be a nice idea in principle, in practice this can never work with this valve in mind. the part that comes into contact with the outside of the rim is made of some hard plastic without any rubber washer present inside it so it cannot actually seal against the rim as most other tubeless valves would; so no matter how much you tighten the ring on top of it you are essentially relying on that one rubber conic end inside the rim which can never work. I did try to install it but can see this major flaw will always fail me. a major disappointment.