Rule 500 Fully Automatic Submersible Pump. The Rule 500 Fully Automatic Submersible Pump 25SA replaces the old 25S. It is fully automated with a computerised operation with a tough, plastic vented body to prevent air locking. It comes with a quick release strainer which allows for rapid cleaning and low amperage draw means it conserves batteries. The base is not interchangeable with the old range but it can be fitted to existing screw holes. Connections: for 19mm (3/4") bore hose.Dimensions: 107mm high x 64mm x 74mm.Current Draw: 1.6A.Fuse Size: 4A.Output: up to 31 litres per minute (7 gallons per minute) at 12v, without a check valve.Maximum recommended discharge head 2m.Checks for water every 2 1/2 minutes (runs for 1/2 second).Consumes 0.20 amps per day.Built-in Thermal Cut-Off.Check Valve included for Back Flow Prevention.Threaded port for easier installation and maintenance.No Need for a separate float switch, third wire for manual override