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Product Details

Whale MK5 sanitation pumps are designed to pump out holding tanks and flush toilets while virtually eliminating nasty smells and blockage. High capacity, manual pumps do such dirty quickly and reliably, pumping up to 17.5 GPM.

Removable inspection ports and tool-free maintenance make these lightweight (only 2.5 lbs) pumps easy to clean and maintain.

MK5 Manual Sanitation Pumps may be mounted in different orientations, and are available in two models: Bulkhead and Thru-Deck. The Thru-Deck model requires the Deck Ring Kit (sold separately, available on this page) to complete installation.

Note:Intended for black waste only. For universal manual bilge/transfer pump applications, use the Whale MK5 Universal Bilge and Water Transfer Pump (sold separately).

Info & Guides
The MK5 manual black waste pump is intended for toilet flush, or holding tank pump-out. Totally sealed unit ensures no odors.

Technical Information


  • Wide hose connections provide maximum performance without blockage
  • Completely sealed durable plastic housing with odor-proof seals eliminates offensive odors while pumping
  • Simple plumbing using standard 1/2" (38mm) hose connections
  • Marine-grade, odor-proof seals
  • Internal Nitrile gaskets for durability
  • Large, virtually non-block valves
  • Lightweight design for easy operation


  • Flow Rate: 15 to 17 GPM
  • Pump Type: Bulkhead or Thru-Deck, manual diaphragm
  • Self-Priming: Yes. 15' max lift
  • Macerating: No
  • Port Outlet Size 1-1/2" inlet/outlet
  • Dimensions: 5.5" H x 7.5" W x 7.5" L (14cm H x 19cm W x 19cm L)
  • Weight: 2.6 lbs. (1.17 kg)