HI, I have recently acquired a BOWSER pump , I would be most interested to know if anyone could tell me what model it may be ,also could the number on the id plate give an idea as to what age it could be ? . Am I correct in saying that this basic type of pump was on sale for a very long period of time ?.
I am also curious as to the purpose of the device that sits on top of the outlet delivery pipe?
Thanks for looking any information would most appreciated.

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pump 2

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device ?