T-H Marine Automatic Aerator ControlKeeps your Bait or Catch Alive & HealthyThis aerator control provides a source of oxygen-rich water to your live well automatically. This unit features a solid-state timer with adjustable off times to adjust to varying conditions. Easily adaptable to existing systems. Simply connect wiring according to instructions provided. Front panel is 3 1/4 x 3 1/4 and requires only 3" behind panel. Will handle a high capacity pump's current draw.Features: Turns Pumps On & Off Automatically; Solid State Aerator Timer- Fully Adjustable; 10 Amp Fully Waterproof Circuitry; Handles High Capacity Pump Current Draw; Requires 3" Round or 2-1/2" Square Hole; Auto Spray (On) Time- 45 Seconds; Auto Delay (Off)- 45 Seconds (min)- 5-1/2 minutes (max);