This Whale Gusher Urchin waste water transfer pump has a flow rate of 55 litres per minute at 70 strokes per minute and 37.5 LPM at 45 strokes per minute. The Whale bilge and waste water pump is suitable for through deck and bulkhead applications and features dual size hose connections for 25mm (1") or 38mm (1-1/2") ID hose. The Whale BP9013 pump is suitable as a primary bilge pump on boats up to, equal to or greater than 12m (40ft) in accordance with ISO150831.