What I find odd is that the curves and performance figures are all shown as at 13.5v, rather than the 12v for our needs.
This makes me suspect that the pump was originally designed for some sort of automotive/marine application, where 13.5-13.8v is the standard alternator car voltage. Perhaps it's a coolant booster pump? Perhaps it's a marine environment water-system pump for supplying water for a boat's domestic water supply? The springs would seem to suggest that this could be the case to deal with the "shocks" of taps being opened/closed quickly.
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