When pressurized water is sprayed through the Fast Flush nozzle, the vehicle holding tank is cleaned so no residue remains.
What makes Fast Flush effective is as the pressurized water sprays through the nozzle, it laterally expands to clean every corner of your vehicle's holding tank.
The patented wide-spray nozzle directs water across and down the full length of the interior of the tank, which pushes all contents of your holding tank out through an open drain.
Fast Flush comes with a check valve that allows fresh flushing water to enter the holding tank, but blocks any outward flow of liquids.  No other vehicle-mounted valve is needed.
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How it works.