and for the final 2 fittings to the power unit, you need to remove the 2 threaded covers. The video shows they guy simply unscrewing them by hand, but mine were on tight. So 13mm there (the video shows that a slotted screwdriver would also work, but my caps don't have the slots for a screwdriver)
Indoor work is done.....
Summary - grab a 13, 17 and 22mm