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Manage Your OP4 Water System

Stay hydrated and clean on your off-road trips with the OP4’s water system! This guide covers the 40-gal tanks, hot showers, and how to drain or winterize—perfect for your camping needs.

Get to Know Your Water System

  • Capacity: 40 gallons total (2 x 20-gal stainless steel tanks).
  • Pump: One 12V pump with a selector lever for front, rear, or both tanks.
  • Connections: Quick connects for the kitchen and shower.
  • Filling: Use the lockable blue-icon points with a potable hose.

Supplying Water

  • Kitchen: Connect the front tank to the passenger-side quick connect.
  • Shower: Use the rear tank for the driver’s-side shower.
  • Transfer: Link the quick connects with a hose to move water between tanks.
  • Hot Shower (Optional): The Eccotemp unit runs on propane for a warm rinse—flow-through design keeps it simple.

Packing Down and Draining

  • Turn off the pump and open faucets to drain.
  • Use the low-point drains on the tanks.
  • Winterizing: Flush with RV antifreeze, sanitize after winter, and drain fully.
  • Pro Tip: Sanitize every 6 months (no bleach) and watch water levels to protect the pump.

Enjoy clean water on your adventures! Contact 925.215.7315 or info@opuscamper.us for support.