I have the hand pump model and it worked well on the seadoo with the 215 in it, but now I have the 230 challenger Boat with two 215s and a way farther down in the haul, Ive been looking at the 12 volt pump , I have no Idea how it would work, it looks like it would be more user frendly.
I use a manual hand pump, moeller 4 liter fluid extractor from wholesalemarine, cost is pricey at $60, but made very well and works awesome, pulls the oil right out very quick when motor is warmed up.