Another pump on my boat is the holding tank dump pump. I have aY on the inlet side. Y fwd is to empty the Holding tank, Y aft is to suck from the bilge. I have a square, flat sucker end so that this pump can take the bilgewater down to 1/4" deep, whereas the Rule pumps elsewhere in the bilge can only get it down to 1.5" deep, or so. Not a huge capacity in an emergency, but every little bit helps.
I also carry a crash pump, 2". I have used it to wash off the docks, help other guys, and once, to drain a high water event in my own bilge. Works good, lives up top, in the open air, under a blue canvas cover, so nobody sees the rust but me. It helps to run it on a regular basis, so you know the ethanol hasn't ruined the gas in its tiny tank. I also try to fill with premium gas when I can, as I do with all of my small gas engines, just to limit the ethanol damage.