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The pump was a freebie from @emorth.Wow Stump I'd love to have one of these but from what I see they're expensive! Does yours have NPT of British Standard threads?
I had spare alligator clips from an old inverter, some spare wires, a 12v relay, and a momentary switch, and just had to source some hose and some brass fittings.
I ran a switch along the fill hose to control the pump.
Total investment is less than $20.
It's dead simple.
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