How To Blow Out RV Water Lines With An Air Compressor

If you’re like most RVers, you probably winterize your rig every year to protect it from freezing temperatures. Winterizing your RV involves adding antifreeze to all of the water lines in your RV, including the fresh water tank, toilet, and shower.

One way to ensure that all of the water is out of your lines is to blow them out with an air compressor. This method is quick and easy, and it will help to prevent any problems with your lines freezing and bursting over the winter months.

What you’ll need to blow out your RV water lines

Air compressor
Adapter to connect air compressor hose to RV water line
Gallon of RV antifreeze

How to connect your air compressor to the RV water lines

  • Start by draining all of the water from your freshwater tank. You can do this by opening the drain valve and running the pump until the tank is empty.
  • Next, disconnect your fresh water hose from the inlet at your RV’s body.
  • Connect one end of your air compressor’s hose to the inlet on your RV’s body. Make sure that the other end of the hose is connected to a regulator so that you can control the amount of pressure going into the lines.
  • Turn on your air compressor and slowly increase the pressure until you reach 30-40 PSI. Once you reach this pressure, open all of the faucets in your RV (including the ones in the shower and toilet) and let the air blow through the lines for a few minutes.
  • Once all of the water has been blown out of the lines, turn off the air compressor and disconnect the hose.
  • Finally, reconnect your fresh water hose to the inlet on your RV’s body and fill up the freshwater tank.

Tips for avoiding common mistakes people make when blowing out their RV water lines

  • Do not use an air compressor with more than 40 PSI of pressure. This can damage your RV’s water lines.
  • Make sure to open all of the faucets in your RV before you start blowing out the lines. Otherwise, you may not get all of the water out.
  • Be careful not to overdo it when blowing out the lines. If you blow too much air through them, it can cause the fittings to come loose. Just let the air flow until all of the water has been blown out of the system.

As long as you follow these tips, you should have no problem successfully blowing out your RV’s water lines with an air compressor. Winterizing your RV is important, but it doesn’t have to be difficult. With a little bit of preparation, you can easily do it yourself.

FAQs about blowing out RV water lines

Just let it go until all of the water has been blown out of the system. You don't want to overdo it and blow the fittings loose.

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