This particular Whale pump, the Whale Gusher Urchin is a fixed handle, compact bilge and waste water transfer pump that features a 43 litre per minute maximum output. The Gusher Urchin has a compact design suited for confined spaces so it is ideal for small to medium sized boats. Whale BP9005 features a robust lightweight design with easy access for maintenance. The manual waste water pump has dual size hose connections for 25mm (1) or 38mm (1-1/2") inside diameter hose."