Neil, the graph should be there somewhere, as noted earlier by Peter Jack. There was no “data” included because I just lifted the graph from within a big, complicated worksheet with a lot of extraneous other information.
Since posting it, I perused some Jabsco information on the internet. Jabsco seems to have hundreds of pumps, not just these little electric ones. The bronze “twin Jabsco’s” appear to have been models 18510-0000 and 18510-0010, which seem to have been the bottom of the line 12v pumps, which, it turns out, even at the time were discontinued. Their replacement appears to be the “stainless” pump.
It is interesting that the deadheaded performance of the twin arrangement is roughly the sum of the two pressures from the published information, but that the flow rates at low pumping pressures don’t begin to compare to that published. When citing pump info, use of the actual model numbers and operating conditions are essential to avoid confusion.
