Skip to content

How to Blow Out RV Water Lines

When it comes to preparing your RV for winter storage or a prolonged period of non-use, one crucial step is to properly blow out the water lines.

Failing to do so can result in frozen and damaged pipes, leading to costly repairs down the line.

In this article, we will provide you with a step-by-step guide on how to blow out RV water lines effectively and ensure the longevity of your recreational vehicle.

So, let’s dive in and learn the best practices for this essential maintenance task.

How to Blow Out RV Water Lines: A Step-by-Step Guide

1. Gather the Necessary Tools and Equipment

Before you begin the process of blowing out your RV water lines, it’s essential to gather all the required tools and equipment.

Here’s a list of items you’ll need:

  • An air compressor with an adjustable pressure regulator
  • A blowout plug or RV blowout adapter
  • Safety goggles
  • Protective gloves

2. Turn Off the Water Supply

The first step in preparing to blow out your RV water lines is to ensure that the water supply is turned off.

Locate the main water valve and shut it off to prevent any water from entering the system during the process.

3. Open All Faucets and Drains

To allow air to flow freely through the system, open all the faucets inside your RV, including the kitchen sink, bathroom sink, and shower.

Additionally, open the low point drains to release any residual water trapped in the lines.

4. Connect the Blowout Plug or RV Blowout Adapter

Next, connect the blowout plug or RV blowout adapter to the city water inlet on the outside of your RV.

Ensure it is securely fastened to prevent any air leakage.

5. Set the Air Compressor Pressure

Adjust the pressure regulator on your air compressor to a suitable level.

It’s recommended to set it between 30 and 50 psi (pounds per square inch) for most RVs.

Consult your RV owner’s manual for specific recommendations if available.

6. Begin Blowing Out the Water Lines

With everything in place, it’s time to start blowing out the water lines.

Turn on the air compressor and gradually increase the pressure until you see water spraying out of the faucets and drains.

Start from the faucet closest to the city water inlet and work your way through each faucet until you reach the furthest one.

7. Repeat the Process

After blowing out the water lines once, repeat the process for thorough cleaning.

It’s essential to ensure that all water has been removed from the pipes, as even small amounts can freeze and cause damage.

8. Remove the Blowout Plug or RV Blowout Adapter

Once you’ve completed blowing out the water lines, turn off the air compressor and remove the blowout plug or RV blowout adapter from the city water inlet.

Make sure to release any remaining pressure before disconnecting the adapter.

9. Drain the Water Heater and Water Tanks

To further protect your RV’s water system, it’s important to drain the water heater and all water tanks completely.

Refer to your RV owner’s manual for specific instructions on how to do this properly.

Frequently Asked Questions (FAQs)

How often should I blow out my RV water lines?

It is recommended to blow out your RV water lines at least once a year, before winter storage, or whenever the vehicle will be inactive for an extended period.

Can I use an air compressor with higher pressure to blow out the water lines more quickly?

While it may be tempting to use higher air compressor pressure to speed up the process, it’s not recommended. Excessive pressure can damage the RV’s plumbing system. Stick to the recommended pressure range mentioned earlier.

What if I don’t have an air compressor?

If you don’t have access to an air compressor, you can use a manual hand pump designed for RV winterization. These pumps create pressure to blow out the water lines effectively.

Can I skip blowing out the water lines if I’m using antifreeze in my RV?

No, blowing out the water lines is still necessary even if you plan to use antifreeze. While antifreeze helps protect the system, blowing out the water lines ensures that no residual water remains, minimizing the risk of damage.

Is blowing out the water lines difficult?

Blowing out the water lines is a relatively simple process that most RV owners can perform themselves. By following the steps outlined in this article and using the appropriate tools, you can ensure proper maintenance of your RV’s water system.

Can I hire a professional to blow out my RV water lines?

If you’re uncomfortable performing the task yourself or prefer to have a professional handle it, you can hire an RV service technician. They have the necessary experience and equipment to blow out your RV water lines effectively.


Taking the time to blow out your RV water lines is an essential step in winterizing your recreational vehicle.

By following the step-by-step guide outlined in this article, you can ensure that your water system remains protected from freezing temperatures.

Remember to gather the necessary tools, adjust the air compressor pressure correctly, and thoroughly blow out all the water lines and drains.

Regular maintenance and preventive measures will help prolong the lifespan of your RV and save you from costly repairs in the future.