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If you hold yout thumb ovrt the end, pump it, and you feel pressure, then yes, it will work.
With that in mind, consider the fact that it takes about 3000 strokes to get enough air in the tube so you can get to the nearest compressor. Don't ask me how I know.
So my opinion is that they're just there for looks, and I carry a small electric pump.
I also have a good bicycle pump in the saddlebag. I usually use this to top off my tires each day.
if you are having to top your tires off daily, you have leaking tubes that need replacing. unless you are going thru major changes in altitude (several thousand feet), you really should not be seeing big changes in your air pressure on a daily basis.
I know Hucky's sells them and good to know that what he's selling may be plastic - I guess I'll ask when I place my parts order.
The ones that Hans sells (Hucky's) are metal and the one I received from him looks identical to the original that's in my R90S.