Whale FW1225 Watermaster Automatic Pressure Pump - 12L - 45PSI - 24V - FW1225FW1225 Watermaster Automatic Pressure Pump 12L 45PSI 24V Whale Watermaster Automatic Pressure Pump. For more than a decade we have refined our pressure pump designs to ensure long term reliability and efficient performance. The Whale Watermaster gives smooth consistent flow at a variety of outlets. Power High flow rates at a variety of outlets Smooth Constant Flow Self Priming Up To 3m (10ft) Performance Quiet Operation Automatic Operation Plug 'n'