Bilge pump
If you have an inboard with a dripping packing gland, then a bilge pump would be desirable. But if you have an outboard model 25.5, I'm not sure its necessary. Just keep an eye on the thru-hull that drains the galley sink. If there's a leak at that location, fix it. That's the only spot I can think of that may be a source of water in the cabin (other than leaking windows).