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As temperatures drop, winterizing your restroom trailer becomes essential to prevent costly repairs from frozen pipes, cracked tanks, broken valves, and other issues. Here’s a quick guide on how to effectively winterize a Lang Trailer, ensuring it’s ready for below-freezing conditions or long-term storage in cold weather climates.

Key Tips Before You Start

• Active Use: If your trailer will still be in use, keep the heat and tank heaters running to prevent freezing.

• Storage Mode: If storing, use RV antifreeze to purge the water lines and tanks.

Winterizing Trailers with Freshwater Systems

1. Drain Freshwater Tank: Empty all water from the freshwater tank.
2. Flush Out Water: Run all sinks and toilets until water stops flowing, then turn off the water pump.
3. Open Valves: Open all accessible valves to fully drain the water lines (Valves 1-6).
4. Antifreeze Application:
   • Attach the winterization hose to a jug of RV antifreeze and open Valve #5.
   • Turn on the water pump and allow antifreeze to flow into the system.
   • Open Valve #3 to let antifreeze enter the fresh water tank, then open Valve #4 briefly to clear the spray bar (if applicable).
   • Run each fixture (toilets, sinks) until antifreeze flows out.
5. Pour Antifreeze in Traps:
   • Add ¼ gallon of antifreeze to each urinal trap, if you're not removing the urinal trap insert. 
   • Add ¼ gallon to each sink drain to fill the "S" traps.
   • If you have external handwashing stations, fill those lines as well.
6. Waste Tank Maintenance:
   • Drain the waste tank completely, and leave the dump valve open to prevent freezing.
   • Raise the tongue jack to ensure any residual water doesn’t settle in the dump valve.

Winterizing Trailers Without Freshwater Systems

1. Set Up Antifreeze Pump: Connect an RV antifreeze hand pump to the trailer’s exterior water inlet.
2. Flush Fixtures: Have one person flush each toilet while another pumps antifreeze into the system until only antifreeze is coming through.
3. Purge Spray Bar (if applicable): Open Valve #4 to ensure the spray bar is clear.
4. Pour Antifreeze in Traps:
   • Add ¼ gallon to each urinal if you're not removing the urinal trap insert and a suitable amount to each sink’s “S” trap.
5. Elevate Trailer Front: Tilt the front of the trailer to drain any remaining water away from the dump valve, reducing the risk of freezing damage.

Need Additional Help with Winterizing Your Trailer?

If you have questions, contact us for assistance with the winterization process!