Can You Use An Air Admittance Valve On A Sewage Pump

Can You Use An Air Admittance Valve On A Sewage Pump: Smartly Move?

Last Updated on May 6, 2023

Are you tired of struggling to vent your plumbing fixtures in a sewage pump system? The air admittance valve (AAV) is what you need. This innovative alternative to traditional venting methods can save time and money, eliminating the need for costly installations.

However, be sure to research before installation because not all jurisdictions allow AAVs in sewage pump systems, and improper installation could result in unwanted penalties and fines.

Today we will discuss using an air admittance valve in the sewage pump system, how to install it, what to consider and where it should be located when installed. So, without further ado, let’s dive into the details of using an AAV in a sewage pump system.

Can You Use An Air Admittance Valve On A Sewage Pump: Basic

What is the purpose of an air admittance valve on a sewage pump

The primary purpose of the valve is to maintain a balanced pressure within the system and prevent the formation of negative pressure inside pipes. A lack of adequate air pressure can lead to siphonage of the water trap, which can lead to unpleasant odors, leaks, or even damage to the system.

The AAV is installed on the vent pipe that extends from the top of the sewage pump system. The valve remains closed under normal conditions, but when negative air pressure develops, it opens and allows air to flow into the system.

This airflow helps to maintain the pressure balance and prevent the creation of siphonage.

How does an air admittance valve work on your sewage pump?

The AAV operates through three primary working procedures: Zero, Negative, and Positive.

Under normal conditions, when there is zero pressure within the pipes, the AAV remains closed, preventing the sewage system from escaping from gasses and odors.

However, in scenarios where negative pressure begins to develop, the AAV valve opens, allowing air to flow into the system. This activity creates a more balanced pressure environment in which the siphonage of the water trap is prevented.

If positive pressure is within the system, the AAV valve closes again, preventing the escape of gasses and odors. Positive pressure is caused by the natural flow of wastewater within the pipes, increasing the air pressure inside the sewage system.

The design of the AAV ensures that it only functions as a one-way valve, ensuring that air flows into the system and isolates the air within the vent pipe. This mechanism prevents siphonage formation and helps vent sewage gasses, which would otherwise circulate throughout the building or surroundings.

How to install an air admittance valve on a sewage pump?

How to install an air admittance valve on a sewage pump

Installing an air admittance valve (AAV) on a sewage pump can be tricky, but it can be done quickly and efficiently with the right knowledge and tools. Here are some steps to follow:

STEP 1. Turn off or disconnect the power supply is crucial to ensure safety and prevent electrical shocks. Locate the power supply switch and turn it off or unplug before starting.

STEP 2. Locate the existing vent pipe: This is typically found near the sewage pump and should be easily identifiable. The vent pipe is essential as it helps to remove any gasses or unpleasant odors from the sewage system.

STEP 3. Cut the vent pipe to a convenient spot: Once you have located the vent pipe, use a pipe cutter to cut it at a suitable spot near the sewage ejector pump. Make sure the cut is straight and even to ensure a proper fit for the air admittance vent valve.

STEP 4. Clean the cut ends of the vent pipe: Use a pipe cleaner or a piece of sandpaper to clean the pipe’s newly cut ends. This will help to remove any debris or rough edges that can impede the proper functioning of the AAV.

STEP 5. Attach the AAV to the cut end of the vent pipe: Place the AAV onto the cut end of the plumbing vent pipe and secure it in place using a pipe clamp or other appropriate fasteners. Make sure the AAV is appropriately aligned and positioned before tightening the clamp.

STEP 6. Turn on or reconnect the power supply: After completing the installation, please turn it on or reconnect it to the sewage pump. This will allow you to test the AAV and ensure it functions properly.

STEP 7. Test the valve by running water through the system: Once the power supply is turned back on, test the AAV by running water through the sewage system. This will allow you to check if the valve is installed correctly and functioning as intended.

Pro Tip – Consult a certified plumber today to know more about using an air admittance valve in a sewage ejector pump system and ensure compliance with local codes.

What to consider before installing an AAV on a sewage pump?

What to consider before installing an AAV on a sewage pump

When installing an AAV on a sewage pump, there are several important factors to consider to ensure that the system operates effectively and efficiently, such:

Local Code

Before installing an AAV in a sewage pump system, knowing any relevant local codes and regulations that may impact the installation process is essential. Local codes may vary depending on the region, and failing to comply with these regulations can lead to fines and other legal issues.

Manufacturer Requirements

Another critical consideration when installing an AAV in a sewage pump system is to ensure you comply with the manufacturer’s requirements. Each product has its installation guidelines and conditions, which must be followed to ensure that the AAV operates effectively and efficiently.


Proper sizing is crucial when mounting an AAV on a sewage ejector pump system. Choosing the correct AAV size for your system will ensure that it operates effectively, provides optimal venting, and lasts many years.

Depending on the size of your sewage pump system, there may be specific AAV sizing guidelines you need to follow.

Pipe Material

The type of pipe material used in a sewage pump system can also impact the installation of an AAV. Different materials have different specifications when it comes to venting, which can affect the effectiveness of the AAV.

AAV Location

Finally, the location of the AAV in the sewage pump system is a critical consideration. The AAV must be installed in a location that optimizes venting performance and accessibility for maintenance purposes.

Does an air admittance valve stop smells in the sewage pump area?

Does an air admittance valve stop smells in the sewage pump area

An air admittance valve is essential in preventing unpleasant odors emanating from the sewage ejector pump area. It effectively stops a vacuum formation in the pipework, allowing waste to drain effortlessly without any foul-smelling gases escaping inside the property.

The valve acts as an air inlet, providing the necessary air that prevents the vacuum from forming in the first place. This innovative solution is ideal for situations where installing traditional venting systems may not be feasible.

Where should the air admittance valve be located on the sewage pump system?

When installing an air admittance valve on a sewage pump system, specific considerations should be considered to ensure optimal performance. The AAV should be placed within the maximum developed length allowed for the vent.

Also, it must be located at least four inches above the horizontal branch drain, six inches above any insulation material, and within fifteen degrees of vertical. Proper placement ensures that the valve effectively prevents vacuum formation and odor emission.

Does an air admittance valve go before or after a trap on a sewage pump?

When considering where to place an air admittance valve in your sewage pump system, installing it after the trap on the drain line of a fixture is recommended. This is because AAVs are one-way vents designed to allow air to enter the drainage system, not to release foul odors from the system.

The trap is a barrier to keep the odors contained, and the valve should be installed downstream. Also, it’s essential to ensure that the valve is compatible with the type of trap being used and any other piping components in the system for optimal operation.

When do you need an air admittance valve for your sewage pump system?

When do you need an air admittance valve for your sewage pump system

Generally, you would need an AAV for your basement sewage pump system to reduce roof penetrations, prevent structural damage, and save money.

To Reduce Roof Penetrations

Roof penetrations are required when conventional drain, vent, and waste (DWV) systems are installed. The installation process can be costly, labor-intensive, and time-consuming. Thus, an air admittance valve can be installed on the roof or within interior walls, eliminating the need for roof penetrations.

To Prevent Structural Damage

DWV systems require vent pipes that extend to the exterior of the building. These vent pipes can weaken the roof’s structural integrity, particularly in poorly ventilated spaces. An air admittance valve eliminates the need for vent pipes, potentially saving you thousands in repair costs.

To Save Money

Air admittance valve helps save money by reducing the time and effort needed to install or maintain your DWV system. The valve is a cost-effective alternative to conventional DWV systems and can be easily installed or replaced without professional assistance.

Are air admittance valves up to code for sewage pumps?

Air admittance valves are approved by the International Residential Code (IRC) for use in most areas of the country with only minor modifications. The IRC requires that air admittance valves meet specific performance standards, and the valve’s installation and use must meet several provisions.

It is important to note that while air admittance valves are widely accepted nationwide, they may not be code-approved in a few jurisdictions. As such, it is essential to consult local building codes and regulations before installing an air admittance valve in your sewage pump system.

Can water come from an AAV after installing it on a sewage pump?

An air admittance valve (AAV) prevents water and sewer gasses from escaping into the home. As such, it should not leak water after installation. However, if you notice water leaks or smell sewer gasses, it may indicate that the AAV is faulty.

If you notice that the air admittance valve is leaking water or allowing sewer gasses to escape, it is crucial to replace it immediately. A faulty valve can cause significant damage to your plumbing system and pose a health risk to you and your family.

Keep Sewage Pump Plumbing Safe and Efficient With Air Admittance Valves

An air admittance valve can be an excellent option to vent your sewage pump system. This can save time and money and is convenient for tight spaces where traditional venting methods may not be feasible.

However, you must follow the manufacturer’s instructions and local codes to install them correctly, or you might face plumbing issues. If you are unsure if an AAV is right for you, consult a professional plumber or building inspector to understand your options better.

Safety should always come first. If you’re confident about your plumbing skills, try installing it yourself. Hopefully, this article has provided you with a better understanding of why sewage pumps require air admittance valves.

Leave a Comment

Your email address will not be published. Required fields are marked *

Scroll to Top