How Much Psi To Blow Out Rv Water Lines

How Much PSI to Blow Out RV Water Lines

As an RV owner, it’s important to properly winterize your vehicle to prevent any damage during the cold winter months. One crucial step in the winterization process is blowing out your RV water lines to remove any remaining water to avoid freezing and potential pipe bursts.

When it comes to blowing out RV water lines, the key is to use the right amount of pressure. While a simple and commonly recommended method is to use an air compressor, it’s important to know how much PSI (pounds per square inch) to use to avoid damaging your RV’s plumbing system.

Determining the Appropriate PSI

The ideal PSI for blowing out RV water lines typically ranges between 30 and 50 PSI. However, it’s crucial to refer to your RV’s manufacturer manual or consult a professional for precise recommendations specific to your vehicle. Different RV models and plumbing systems may have varying pressure requirements.

Using excessive PSI can lead to damage, including burst pipes or even dislodging components within the system. On the other hand, insufficient pressure may not effectively clear out all the water, leaving behind pockets that could freeze and cause damage.

It’s also worth mentioning that different plumbing fixtures within the RV may have different pressure tolerances. For example, sinks, toilets, and showers may have their own specific pressure limits. Therefore, it’s vital to exercise caution and follow the manufacturer’s guidelines.

The Right Equipment

To blow out your RV water lines, you’ll need the appropriate equipment. Here’s what you’ll need:

  • Air Compressor: Invest in a good quality air compressor with a pressure gauge. This will allow you to regulate and monitor the PSI accurately.
  • Compressor Regulator: It’s recommended to use a compressor regulator to set the pressure within the desired range.
  • RV Blow Out Plug: This attachment screws into the city water inlet and allows you to connect the air compressor hose to your RV’s plumbing system.
  • Personal Protective Equipment (PPE): Safety goggles and ear protection are essential to protect yourself from any potential accidents or excessive noise during the process.

The Blowing Out Process

Follow these steps to properly blow out your RV water lines:

  1. Ensure all the faucets, showerheads, and water fixtures inside your RV are closed tightly.
  2. Connect the RV blow out plug to the city water inlet.
  3. Attach the air compressor hose securely to the blow out plug.
  4. If your RV has multiple zones, start with the zone closest to the water pump.
  5. Gradually increase the air compressor’s pressure, starting from the lowest setting. Use the pressure gauge to monitor the PSI.
  6. Open the faucet or water fixture furthest from the water pump first until you see a consistent flow of air coming out.
  7. Work your way through each faucet and water fixture inside your RV, opening them one at a time.
  8. Once you have cleared all the lines, turn off the air compressor and release any remaining pressure.

Remember, always follow the manufacturer’s guidelines and recommendations for your specific RV model. If you’re unsure about the process, it’s best to consult a professional to ensure your RV water lines are properly blown out.

Frequently Asked Questions For How Much Psi To Blow Out Rv Water Lines

What Is The Ideal Psi To Blow Out Rv Water Lines?

The ideal PSI to blow out RV water lines is around 30-50 PSI. This range ensures effective removal of water without causing any damage to the lines.

How Do I Determine The Right Psi For My Rv’s Water Lines?

To determine the right PSI for your RV’s water lines, consult your RV owner’s manual or contact the manufacturer. They will provide you with the specific PSI recommendation for your RV model.

Can I Use A Regular Air Compressor To Blow Out My Rv Water Lines?

Yes, you can use a regular air compressor to blow out your RV water lines. Just make sure to adjust the pressure to the recommended PSI range and use appropriate attachments to connect the compressor to the water lines.

What Happens If I Use Too Much Psi To Blow Out My Rv Water Lines?

Using too much PSI to blow out your RV water lines can cause damage to the lines, fittings, and fixtures. This can lead to leaks, bursts, and costly repairs. It’s important to stay within the recommended PSI range.

Are There Any Precautions I Should Take When Blowing Out My Rv Water Lines?

Yes, there are precautions to take when blowing out your RV water lines. Make sure to turn off the water pump, open all faucets and drains, and follow the proper procedure outlined in your RV owner’s manual. Additionally, wear safety goggles and use caution to prevent any injuries.


Blowing out RV water lines is an essential step in winterizing your vehicle. Remember to use the appropriate amount of PSI, typically ranging between 30 and 50 PSI, to avoid damaging your RV’s plumbing system. Always consult your RV’s manual or seek professional advice if you have any concerns or questions. By properly blowing out your RV water lines, you can ensure a smooth and problem-free start to the next camping season.

Leave a Comment