Amarine-made 12v Water Pressure Diaphragm Pump 4.3 L/min 1.1 GPM 35 PSI - Caravan/rv/Boat/Marine On-demand, automatic water pump for small boats, campers, and vans Built-in 35 PSI pressure switch for automatic stop/start Self-priming--allows it to be mounted above tank; able to run dry Built-in thermal protector; 3/8-inch hose barb ports 1.1 Gallons per minute (4.2 Litres per minute) ;The New Pump have some water inside due to factory test, every pump will undergo a rigorous test before put on the market