The Shrader valve looks just like the one on your bicycle or car tire. Just a tiny pin sticking up inside the valve. I don't remember who I got mine...
I's not the old style Schrader valve is it? Maybe those were only used on the early 280cc bottles. If it is they are an easy fix with a small bicycle...
I have a 400?cc R7 buddy bottle that leaks badly so needs a new valve. Found what I need on the best fittings website but no tool ? Smooth with round...