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how does a sprinkler head open when it is exposed to heat? I had a quick look at one a few days ago and thought maybe it had to do with contraction/expansion of the metal? The sprinkler head was an old design, with a "cookie cutter" shape to spread the water out.
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"Asking a bomb squad if an old bomb is still "real" is not the best thing to do if you want to save it." - denim
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