Do I Need an RV Backflow Preventer? Do I Have More Than One? Where Do They Go?
Do I Need an RV Backflow Preventer? Is There a Backflow Preventer for My RV Shower?
I heard I need a backflow preventer for my RV… Is this same thing as an RV pressure regulator or a check valve? Let’s find out!
When it comes to owning and maintaining an RV, there are various considerations to ensure a safe and comfortable experience. One of those considerations is whether or not you have and or need a backflow preventer for your RV. It can get pretty confusing when looking online as to what type of backflow preventer is legally required at campgrounds and other variations of check valves that may or may not already be in your RV, but are not legally required.
In this blog post, we will explore the reasons why you might need an RV backflow preventer, what shower backflow is, how a backflow preventer works, what type of backflow preventer you need to buy for campgrounds, as well as why your RV shower may be filling up with sewer water, and whether some RV showers empty into the black tank.
Overview:
Are there different types of backflow preventers for RVs?
How do I choose the right backflow preventer for my RV?
Is There an RV Shower Drain Backflow Preventer?
Do Some RV Showers Empty into the Black Tank?
Do Campgrounds Require RVs to Have a Backflow Preventer?
The legal requirements for backflow preventers in RVs can vary depending on the specific campground and local regulations. While many campgrounds require RVs to have backflow preventers, it is not a universal requirement.
Backflow preventers are devices designed to prevent the reverse flow of water, which can contaminate the water supply. They are typically installed at the point where the RV’s fresh water hose connects to the campground’s water supply.
If A Campground Requires a Backflow Preventer, where does it go?
This is important: There is a lot of confusion as to what backflow preventers are and where they need to be placed to meet legal requirements.
If a campground requires the use of a backflow preventer, it is usually the responsibility of the RV owner to install and maintain it. The backflow preventer is typically attached to the end of the fresh water hose that connects to the campground’s water hookup. This ensures that any potential backflow from the RV’s plumbing system is prevented from contaminating the campground’s water supply.
Do I Need a Backflow Preventer and a Water Pressure Regulator?
This is a great question! These are two separate functions which typically require two different devices.
A backflow preventer like the Camco Backflow Preventer is installed between the city water connection and your fresh water tank to prevent the city water connection from overfilling your fresh water tank and worst case from contaminating your fresh water. The water pressure regulator like the ones we discuss on this post , should be used in line with on the opposite side of the city water connection so you can adjust pressure for your trailer whether using your tank or the city water connection.
For more information on “Why It’s Important to Use an RV Water Pressure Regulator: Protecting Your RV’s Plumbing System”
Image Source: RV Love Mark and Julie Benet
It is important to check with the specific campground or local authorities to determine if backflow preventers are required and to get guidance on their installation and maintenance.
Internal RV Backflow Preventers and Check Valves
Many RVs come equipped with on or possibly more internal RV backflow preventers also referred to as check valves. Both devices serve the purpose of preventing the reverse flow of water in the RV plumbing system.
An internal RV backflow preventer or check valve is typically installed within the RV’s plumbing system to prevent water from flowing back into the RVs water supply lines. It allows water to flow in one direction but prevents it from flowing back in the opposite direction.
These devices are commonly used in RVs to prevent contamination of the water supply and maintain the integrity of the RV plumbing system. They are often installed at various points in the plumbing system, such as at the water pump, the city water inlet, or the water heater, or just below the bathroom sink to ensure that water flows in the intended direction and does not backflow.
NOTE: This is an area of great confusion in terms of legal requirements. Just because your RV has an internal backflow preventer or check valve doesn’t mean that you meet a campground or State’s legal requirements. To meet a campground or State’s legal requirements you must have a backflow preventer between your RV fresh water hose and the campsite’s water hookup.
So, while the terminology may vary, an internal RV backflow preventer and a check valve generally refer to the same type of device used to prevent backflow in an RV’s plumbing system.
How Does a Backflow Preventer Work?
A backflow preventer is a mechanical device that allows water to flow in one direction while preventing it from flowing in the opposite direction. It consists of check valves that open and close based on the water pressure. When the water pressure is higher on the freshwater side, the check valves open, allowing water to flow into the RV’s plumbing system. However, when the water pressure drops or reverses, the check valves close, preventing any backflow of contaminated water.
Are there different types of backflow preventers for RVs?
Yes, there are different types of backflow preventers available for RVs. The specific type of backflow preventer you choose will depend on your RV’s plumbing system and the requirements of your setup. Because there are different types of check valves this adds another layer of complexity to making sure you get the right one.
Here are a few common types of backflow preventers used in RVs:
1. Inline Check Valve:
An inline check valve is a simple and cost-effective backflow preventer. It is installed in the water supply line and allows water to flow in one direction while preventing backflow. Inline check valves are typically made of plastic or brass and are available in various sizes to accommodate different RV plumbing systems.
2. Atmospheric Vacuum Breaker (AVB):
An atmospheric vacuum breaker is a backflow preventer that uses air pressure to prevent backflow. It is commonly used in RVs and other plumbing systems. AVBs are installed at the highest point in the plumbing system, such as under the sink or behind the shower fixture. They allow air to enter the system when there is a drop in pressure, preventing backflow.
3. Pressure Vacuum Breaker (PVB):
A pressure vacuum breaker is another type of backflow preventer commonly used in RVs. It is typically installed at the point where the water supply enters the RV. PVBs use a spring-loaded check valve and an air inlet valve to prevent backflow. They are effective in protecting against backflow caused by backpressure and back-siphonage.
4. Reduced Pressure Zone (RPZ) Assembly:
RPZ assemblies are more complex backflow preventers that provide a higher level of protection against backflow. They are commonly used in commercial and industrial settings but can also be installed in RVs with more complex plumbing systems. RPZ assemblies consist of multiple check valves and a relief valve to ensure reliable backflow prevention.
How do I choose the right backflow preventer for my RV?
Choosing the right backflow preventer for your RV involves considering several factors. Here are some key considerations to help you make an informed decision:
1. RV Plumbing System:
Understand the plumbing system of your RV. Determine the size and type of pipes used, as well as the overall configuration. This will help you choose a backflow preventer that is compatible with your RV’s plumbing system.
2. Backflow Prevention Requirements:
Consider the level of backflow prevention required for your RV. Different regions may have specific regulations or guidelines regarding backflow prevention. Research local codes or consult with a professional to ensure compliance with the necessary standards.
3. Type of Backflow Preventer:
Evaluate the different types of backflow preventers available for RVs, such as inline check valves, atmospheric vacuum breakers (AVBs), pressure vacuum breakers (PVBs), or reduced pressure zone (RPZ) assemblies. Each type has its own advantages and suitability for specific applications. Consider factors such as ease of installation, maintenance requirements, and level of protection provided.
4. Space and Installation Considerations:
Assess the available space in your RV for installing a backflow preventer. Some backflow preventers may require more space or specific mounting positions. Ensure that the chosen backflow preventer can be easily installed in your RV without interfering with other components or systems.
5. Budget:
Consider your budget for purchasing and installing a backflow preventer. Prices can vary depending on the type and quality of the backflow preventer. Set a budget range and look for options that fit within your financial constraints while still meeting your requirements.
6. Professional Advice:
If you are unsure about the right backflow preventer for your RV or need assistance with the installation, consider consulting with a professional or an RV service center. They can provide expert advice based on your specific RV setup and requirements.
When choosing a backflow preventer for your RV, consider factors such as the size and configuration of your plumbing system, the level of backflow protection required, and any specific regulations or requirements in your area. It is recommended to consult with a professional or RV service center to determine the most suitable type of backflow preventer for your specific RV setup.
How to Install an RV Backflow Preventer at Your Water Heater?
To install the Camco RV Water Heater Backflow Preventer, follow these steps:
1. Turn off the water supply to the RV water heater. This can usually be done by turning off the main water supply valve or by shutting off the water pump.
2. Locate the cold water inlet connection on the water heater. This is where you will install the backflow preventer.
3. Clean the threads on the cold water inlet connection using a wire brush or a cloth to remove any debris or old tape.
4. Apply a layer of plumber’s tape or thread sealant to the threads of the cold water inlet connection. This will help create a watertight seal.
5. Screw the Camco RV Water Heater Backflow Preventer onto the cold water inlet connection. Use a wrench to tighten it securely, but be careful not to overtighten and damage the threads.
6. Turn on the water supply to the RV water heater and check for any leaks around the backflow preventer. If you notice any leaks, tighten the connections further or reapply plumber’s tape.
7. Once you have confirmed that there are no leaks, you can turn on the water heater and use it as usual.
Note: It’s always a good idea to consult the manufacturer’s instructions that come with the Camco RV Water Heater Backflow Preventer for any specific installation guidelines or recommendations.
Is There an RV Shower Drain Backflow Preventer?
What is Shower Backflow?
Shower backflow occurs when there is a reversal of water flow, causing contaminated water to flow back into the freshwater supply. In an RV, this can happen when there is a sudden drop in water pressure, such as when the water pump is turned off or when there is a break in the water line. If a backflow preventer is not in place, the contaminated water from the shower can flow back into the freshwater supply, posing a health risk to the occupants of the RV.
Why is My RV Shower Filling Up with Sewer Water?
If you notice that your RV shower is filling up with sewer water, it could be due to a malfunctioning or missing backflow preventer. Without a backflow preventer, there is a possibility of sewer water flowing back into the freshwater supply, leading to contamination. Additionally, other factors such as clogged or damaged plumbing lines, faulty valves, or improper installation can also contribute to the issue. It is crucial to address this problem promptly to avoid health hazards and further damage to your RV’s plumbing system.
Do Some RV Showers Empty into the Black Tank?
Yes, some RV showers do empty into the black tank. The black tank is designed to hold and store waste from the RV’s toilet. In certain RV models, the shower drain may be connected to the black tank to consolidate all wastewater in one place. This setup allows for easier management and disposal of the waste. However, it is important to note that not all RVs have this configuration, and the drainage system can vary depending on the RV model and manufacturer.
Is There an RV Shower Backflow Preventor?
If your RV has a backflow preventer under the shower drain then it is almost certainly a Hepvo trap. A Hepvo trap is a type of waterless trap used in plumbing systems, including those in RVs (Recreational Vehicles). It is designed to replace traditional P-traps and S-traps, which require water to create a seal and prevent sewer gases from entering the living space.
The Hepvo trap is a valve-based device that uses a diaphragm to create a seal, eliminating the need for water. It is typically made of durable plastic and is compact in size, making it suitable for RVs where space is limited.
In an RV, the Hepvo trap is commonly used in applications such as sinks, showers, and other drain outlets. It is installed directly below the drain outlet, connecting the drain pipe to the RV’s plumbing system. The compact design of the Hepvo trap allows for easy installation in tight spaces, making it a popular choice for RV owners.
Travels & Tavails provide a great video on how they installed one on their Casita trailer;
In Summary
By considering these factors, you can choose a backflow preventer that is suitable for your RV’s plumbing system, meets the necessary backflow prevention requirements, and fits within your budget. Remember, proper installation and regular maintenance of the backflow preventer are essential to ensure its effectiveness and the safety of your RV’s water supply.
Hopefully this post helped you understand the different types of backflow devices inside and outside your RV plumbing system, as well as which may or may not be necessary,
Remember, if you are unsure about any step or encounter difficulties during the installation process, it is recommended to consult a professional or seek assistance from an RV service center. Proper installation of a backflow preventer is crucial to ensure its effectiveness and maintain the integrity of your RV’s plumbing system.
Originally published at https://www.happycampers.store.
