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Message: <blockquote data-quote="OldOneEye" data-source="post: 1364169" data-attributes="member: 547986">I love water analogies.  You know that feeling you get when you take a shower and then someone flushes the toilet somewhere else in the house and you lose pressure and get scalded?  Now imagine that you put a small tank of cold water right by your showerhead that kicks in if the pressure drops, preventing you from getting burned.Supposedly the small tank near your shower head is like a cap.  Even though there is tons of water flowing around, even a small drop in pressure causes problems.How big of a deal they make is something else really (as mentioned here).Juan</blockquote>

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