All Galaxy kayaks are self-draining; a very important point to consider when buying a sit-on-top kayak.
The kayaks have several drainage points which come equipped with rubber "scupper" plugs. These plugs are always left in, unless you are purposely allowing water to flow through the kayak, i.e.; when surfing waves with it.
Should unwanted water enter whilst kayaking you simply remove the plugs from the affected area, paddle ahead and pick up some speed. This inertia creates suction and withdraws the water.
Once it is empty, replace the plug.