RV Low Point Drain [How to Use] Winterize

RV low point drains are located at lowest physical place so that water can be drained out for the season.

Allows water lines to drain for winter storage, not water tanks.

You RV probably has 2, one for hot and cold, located near axles.



  1. Hot Water Low Point Drain: This is used to drain the hot water from the RV’s plumbing system. It is usually located near the hot water heater and is marked with a red valve or plug.
  2. Cold Water Low Point Drain: This is used to drain the cold water from the RV’s plumbing system. It is usually located near the fresh water tank and is marked with a blue valve or plug.


To use the low point drains, follow these steps:

  1. Turn off the water supply to the RV.
  2. Locate the low point drains and remove the valve or plug on each one.
  3. Let the water drain out completely. Make sure to open any faucets or valves in the RV to allow air to enter the system and help the water drain out.
  4. Once the water has drained out completely, replace the valves or plugs and turn the water supply back on.




Step-by-step guide to winterize your RV:

  1. Drain all water tanks: Empty the fresh water, gray water, and black water tanks. Open all faucets, including the shower and toilet, to ensure all water is drained from the system. Don’t forget to drain the water heater as well.
  2. Bypass the water heater: Locate the water heater bypass valve in your RV and turn it to the bypass position. This will prevent antifreeze from entering the water heater during the winterizing process.
  3. Use RV antifreeze: Purchase non-toxic RV antifreeze, typically pink in color, from a local RV supply store. The amount you’ll need depends on the size of your RV’s plumbing system, but 3 gallons is generally sufficient for most RVs.
  4. Introduce antifreeze into the plumbing system: There are a few methods to do this: a. Use a water pump converter kit to draw antifreeze directly from the antifreeze container. b. Disconnect the inlet side of the water pump, attach a short piece of hose to the pump, and insert the other end of the hose into the antifreeze container. c. Use a hand pump to push antifreeze through the city water inlet.
  5. Pump antifreeze through the plumbing system: Turn on the water pump and open each faucet (hot and cold) one at a time until the pink antifreeze flows out. Repeat this process for the shower, toilet, and any outdoor faucets or showerheads. Make sure to flush the toilet until antifreeze appears in the bowl as well.
  6. Drain holding tanks: Pour a small amount of RV antifreeze down each drain to protect the P-traps and tank valves.
  7. Close all faucets: Once all faucets have been flushed with antifreeze, turn off the water pump and close all faucets.
  8. Remove or disconnect the RV battery: If you’re storing your RV in freezing temperatures, remove the battery and store it in a warm, dry place. If you’re storing your RV in a location where temperatures will not drop below freezing, you can leave the battery connected but ensure it’s fully charged and disconnect any devices that may drain the battery.
  9. Inspect and clean the RV: Clean your RV’s interior and exterior, remove any perishable items, and check for any signs of damage or leaks. Cover any vents or openings to prevent rodents or insects from entering the RV during storage.
  10. Cover your RV: If possible, store your RV under a shelter or use an RV cover to protect it from the elements.