Sorry pic here for Trigger as I can't seem to attach pic in a PM and lost your email address !!
Pump delivers 50l/min at 1440 rpm (I think 660 gals per hour) but obviously you can run it at a slower speed. I just dug it out of the bowels of my garage and photod it ..somewhere even deeper I have a small 3-phase motor (0.33kW) that fits it and a small single phase to three phase inverter/variable speed control which could be set to 50 gals/hour.
If I can find it all (sure its all there somewhere) you are welcome to it if its any use, as I will never use it. Seriously need to declutter before I get a visit from ' Extreme hoarders'.
Approved for use on petrol vapour recovery, so safe on paraffin.
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