#1 Choice of Marine Sanitation devices in the #2 Business

Behind Tank

The BEHIND TANK is a fully self-contained Automatic Water Waste Discharge System.

The BEHIND TANK was designed to look just like the AHEAD TANK and connects right behind the AHEAD TANK at the same gravity water flow.

The BEHIND TANK comes complete with a  submersible pump and is equipped with an 8-ft long, 3 prong grounding type power cord. Motor is oil filled and sealed for cooler running and designed to operate under water.

The BEHIND TANK REPLACEMENT PUMP (also sold seperately) includes a float switch for automatic pump operation, check valve, and lid. This pump is not suitable for aquatic life.


Additional information

Featured is the Ahead Tank Model AT-20D with the Behind Tank installed directly behind the Ahead Tank.

Sump Pump Specifications: Weight 21lbs.; Max. 70 GPM; 25ft. Max. Lift Motor: 1/2 HP, 110-115 V, 60 Hz

The BEHIND TANK measures 18″ x 18″ x 18″..




  • Reliable/Automatic Operation
  • Corrosion Proof, LLPE material
  • Lightweight/Compact
  • Submersible Sump Pump
  • Vertical Float Switch
  • Internal Check Valve

Behind Tank Installation Diagram with 150SV Vortex Sump Pump 220V

Behind Tank Replacement Pump













International Shipping

We Ship Worldwide

IMO Approved

For International Use

U.S.C.G Certified

We Ship Worldwide


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