Because some dude used to rant all over the internet on the virtues of balanced pee valves. Same guy also said make all your second stages finger tight and do really deep stops and then shorten your shallow stops. :D
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#39 or so who is mystified as why anyone would get a balanced pee valve.
Interesting link..... I"m going to steal it and open a new thread because now I have questions not appropriate to a thread on P-valves.....