got me a Lost Lakes U-tube at Bass Pro and I have thoroughly not been able to open the Boston valve in order to inflate it. The thing appears to have at least two sets of concentric openings. I am pretty sure that at least one of them pops open but I am afraid that I am going to bust something if I force the wrong part.
So far Bass Pro has not responded to my requests for customer assistance so I am hoping that someone with float tube experience can advise as to how to open this valve properly.
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