Largest Whale Bilge Pump Maximum output - delivering over 117 ltrs (31 US gals) per minute Efficient operation - double acting pumps on both to and fro storkes Reliability under extreme conditions - Twin diaphragms ensure pump continues working if one is damaged Durability - Powder coated diecast aluminium alloy Pumps oily bilge water or effluent Safety guaranteed -keeps pumping even if one diaphragm is damaged No tools required for inspection and cleaning 3 mounting options - Available for deck, bulkhead or underdeck (deckplate included with BP3020) mount