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Whale Mark 5 Double Acting Pump Bulkhead/Thru Deck/On Deck

Based on the original Henderson pump a design that stands the test of time. Robust and lightweight polypropylene  high capacity manual bilge pump range with three mounting options. This clever bilge pump design allows great versatility in installation so that you can fit the pump in the orientation to best suit your boat.

Key Features

  • Whale’s most versatile high performance pump design
  • 3 mounting orientations – 1 pump- (on-deck, thru-deck, on-bulkhead)
  • High Performance – flow rate (104 ltrs / 27.5 USgals / min)
  • Reliability – non choke valves and fully enclosed protected diaphragm
  • Ease of maintenance – inspection hatch (no tools required)
  • Suitable for pumping bilge water,saltwater or diesel
  • Will continue to pump even if one diaphragm fails


  • Hose Connections : 38mm (1 1/2")
  • Maximum Suction Lift : 4.5 m (15 ft)
  • Maximum Discharge Head : 4.5 m (15ft)
  • Suction Lift : 1 m (3ft)
  • Discharge Head : 0.5 m (1.5 ft)
  • 45 Strokes per Minute : 64 ltrs (17 US gals)
  • 70 Strokes per Minute : 104 ltrs (27.5 US gals)
  • Weight: 2.8kg (6 lbs)


  • Mark 5 Double Acting Bulkhead Mount
  • Mark 5 Double Acting Thru Deck
  • Mark 5 Double Acting On Deck

    It is important to ensure that a vented anti-syphon loop is incorporated in the system

     Awards and accreditations

    ISO150831- Suitable as a primary bilge pump on boats equal to or greater than 12 m (40ft) in accorance with ISO150831

    Approved by Lloyds (MCA) and USCG (Mk5 Universal MCA - Size 2)

    Life boats approval

    Mounting Orientation: 3 possible orientations - 1 pump

    Range: Tough and lightweight Polypropylene

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