No through-hull
To empty your water tank, you must either run it through the sink using your pump, un-hook the hose, drain it into the bilge and pump out with the bilge pump, or siphon it out (a shop vac works too). In any case, once it's "empty", you need to remove the remainder that is below the take-off, either using a sponge. a shop vac, a siphon, or whatever. There is no direct connection to any through-hull for your drinking water system.SteveAlchemist C-320