The Tsunami Recirculating Kit recirculates livewell water to keep it cooler and richer in oxygen. This self-contained system feeds a separate aerator spray head and works even while you are underway and cannot use a thru-hull connection. Add this kit to any tank that already has a freshwater fill system. Or use as a backup pump for a fail-safe system. Recirculating Kit Includes: 500 GPH Tsunami aerator pump with short inlet, threaded outlet; 4125-1 aerator spray head; 4232-1 stainless steel strainer; 2 plastic hose clamps; 3/4" diameter 23" poly hose and straight thread-to-barb connector.