It just drains into the bilge. Then you can pump what little was left in the livewells out with your bilge pump and/or pull the plug when you get it on the trailer.
The Margay has a pump out in the red valve. You pull it in and out to either pump in or pump out the live well. Its a simple system and a drain is added to totally flush the wells into the bilge if desired.
i know that the live well will pump out , i want to ad a plug to get the rest of the water out that pump does not pick up my boat did not a drain when new 12 model
Drain plugs come in three variations at BCB, 1. Drain tubes that must be tool flared, 2. Fittings that are plastic and use a 5/8″ plug and 3. The stainless steel twist in style that are on Premium models. Just call parts and see what you prefer.