Guide to the Nautilus P3 System

This article and video applies to any nuCamp model equipped with the Nautilus P3.


The Nautilus P3 system is used in the 2025 TAB 320, TAB 360, TAB 400, Cirrus 620, Cirrus 820, and Cirrus 920 models to streamline water management by centralizing essential functions. Below is an overview of its components, functions, and modes.




Step 1: Understanding the Nautilus Panel Components

The front panel of the Nautilus system includes the following key components:

  • City Water Hookup – Connects to city water for direct supply.
  • Black Tank Flush Hookup – Used to clean out the black tank by flushing it with fresh water.
  • Coax Connection for Interior TV – Provides a TV connection inside the camper.
  • Water Pump Switch – Turns on the water pump (identical to the interior pump switch).
  • External Shower – Allows access to hot and cold water outside the camper.
  • Mode Selection Knobs – Adjusts the system’s settings for different functions.
  • Instruction Key Sticker – Provides visual guidance on knob positions for each mode.

Step 2: Nautilus Panel Modes

1. Dry Camping Mode

  • Allows you to pump water from the freshwater tank to your fixtures.
  • Ensure the pump is turned on, either at the Nautilus panel or inside the camper.

2. Power Fill Mode

  • Used to fill the freshwater tank using a garden hose.
  • Connect the hose to the City Water Hookup and allow it to fill the tank.

3. City Water Mode

  • Directly supplies water from a city water connection to your fixtures, bypassing the freshwater tank.
  • No need to use the pump in this mode.

4. Sanitize Mode

  • Used when de-winterizing or sanitizing the system.
  • Connect a bucket or container to the City Water Hookup and siphon liquid into the fresh tank.

5. Winterize Mode

  • Used only during winterization to run RV antifreeze through the system.

Step 3: Using the Black Tank Flush

  • Connect the city water hose to the Black Tank Flush Hookup.
  • This allows fresh water to be forced through the black tank, helping flush out residual waste.

Important Notes:

  • Always use an inline water pressure regulator when connecting to city water (included in your welcome pack).
  • Follow the instructional sticker on the Nautilus panel for proper knob positioning.


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How to Flush the Black Tank


The black tank flush is a useful feature that helps you maintain your RV’s black tank. Whether you're prepping for storage, maintaining accurate tank sensor readings, or simply keeping your tank clean, using the black tank flush can make a big difference in the longevity and functionality of your system.


When Should You Use the Black Tank Flush?

You might consider using the black tank flush in the following situations:

  • Tank sensors are reading inaccurately: If your monitor panel shows incorrect readings, residue buildup could be to blame.

  • Before winter storage: Flushing the tank before storing your RV can prevent unpleasant odors and buildup.

  • Regular maintenance: Periodic flushing helps reduce the buildup of gunk and keeps the tank in good working condition.

How to Use the Black Tank Flush

Follow these steps to safely and effectively use the black tank flush:

  1. Hook up your sewer hose
    Always ensure your sewer hose is properly connected to a dump station or appropriate waste outlet.

  2. Locate the black tank flush inlet
    This is usually labeled and located on the exterior of your RV.

  3. Connect a garden hose
    Attach one end of a garden hose to the black tank flush inlet.

  4. Connect the other end to a water source
    Use a hose that is separate from your drinking water hose, and always connect through an inline pressure regulator to avoid over-pressurizing the system.

  5. Monitor tank levels
    It’s important not to overfill the tank. You can monitor your tank levels in one of two ways:

    • Use your tank monitor panel to keep an eye on the black tank fill level.

    • Open the toilet valve and visually inspect the tank level.

  6. Stop the flush when nearly full
    Once the tank is nearly full, shut off the water and disconnect the hose.

  7. Empty the black tank
    Drain the contents of the black tank into the sewer connection.

Need Help?

If you have any questions or need assistance, feel free to reach out to our tech team at Tech@nucamprv.com.