The V2 is our reversible check valve (RCV 75) that allows a single pump to perform the basic livewell functions necessary to keep your catch alive in a passive or automatic manner. By mounting the pump to the valve body, the operator only has to decide whether he wants his livewell functioning or empty. When the first fish is caught, place the valve in the "AUTO" position and turn on the pump. When the boat is off plane the pump will recirculate and aerate the livewell water and simultaneously blend in a portion of fresh lake water. Used livewell water is expelled out the overflow as fresh water enters to prevent any ammonia build up. When the boat is put on plane, the valve's check flapper will prevent water loss out the drain, and allow the pump to continue its re-circulation duties. Any water lost out the overflow while running on plane is automatically made up when the boat is brought off plane at the next fishing location. All this is accomplished without any operator assistance. To empty, simply turn off the pump and move the valve to the "EMPTY" position for gravity draining.