Reddit reviews attwood 4143-4 Large-Box 12V Shower Sump Pump System - 36" Wire, 750 GPH, One Size
We found 1 Reddit comments about attwood 4143-4 Large-Box 12V Shower Sump Pump System - 36" Wire, 750 GPH, One Size. Here are the top ones, ranked by their Reddit score.
Delivers outstanding performance for fast water flow into and out of the sumpVersatile system can utilize multiple inlets hooked up to more than one drain source using different hose sizesCan handle inflow from the head sink, shower stall, and galley sinkLarge sump box includes air vent to prevent air locksLid with gasket snaps in to allow quick installation, and for removal for cleaning¾-inch interior diameter outlet hoseRated for 12 volts, uses 22-inch wire connection
The actual phrase you're looking for is "shower sump pump". They already exist for the marine boater market, and can be found on Amazon ( example ). I'm going to be using one of these in my build, also because I'm in Canada.