Better than the ones I made!
I have made my own version of this a few years back when I could not find any caps for my camelback podium and others. You would not believe what i devised. Essentially i took a rubber thumb projector and wrapped electrical tape around it while securing a blacksting within the tape wrap and tied the other end around the neck of the nozzle base. Not easy on or off but did keep the dust and debris out. Love these easy on and off while riding.
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