Okay.....for $9.99 the pump screwed on to the plastic spout...but did not want to tighten all the way....it would hit a point an would pop and start from the begging again on screwing it on....figured where it was about to pop and stopped...if the top of the can was a "hard" piece and not a pop up plastic piece this probably would not have been an issue...... put the hook end into the filler hole and started pumping....had to hold the base of the pump down since the spout would flex when I pumped....hook end was in the filler hole stayed in with no indication of falling out while I pumped........126 stokes later it was full....
1.56 gallons is the capacity of the rear differential on this mower.......
End of tubing (hook) fits into a hole in the pump cap to drain back into the bucket......
Clean no mess......not fast....arm is tired....but for a small piece of equipment like this lawn mower......better than holding the 5gl can in the air until it was over flowing on the ground......
There were a few more that had a longer handle that may be better for a larger tractor......Northern Tools had a couple too......if this one breaks will probably try one with a handle with move leverage.