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Simple, straightforward and low shipping rates for these auto vents.


Auto Vents - Air Admittance Valves - Home Sewer Vents


PlumbingSupply.com® offers auto vents, vent filters, and air admittance valves in various styles and installation types. An air admittance valve may sometimes be used as an alternative to extending a vent through the roof or sidewall to the open atmosphere. Click here for more information.

Click on any of the below links to jump to that product

Aluminum Maxi-Vent Cover -- Recessed Box for Mini-Vents
Ayrlett PVC and ABS AAVs -- Sure-Vent® Air Admittance Valves
STUDOR® Maxi-Filtra Vent Filter -- Ayrlett® Ayr-Filter Vent Filter

Air Admittance Valves by STUDOR®
Mini-Vent air admittance valves Maxi-Vent air admittance valves These air admittance valves feature:
  • Pressure sensitive valve
  • Opens upon fixture discharge
  • Admits air into drain, waste and vent systems
  • Closes to prevent foul air inside
  • Can be used as individual, branch, circuit or stack vent
  • Expands architectural design limits
  • Reduces the number of fire-stopping applications
  • Exclusive vermin protection system
  • Limited lifetime warranty for replacement of defective valves
  • Limited outdoor use if protected from the elements
  • Considered "the standard" by some
  • Roof penetration is reduced - when code allows
  • Sized for IPS pipe
  • NSF Standard 14
  • ASSE 1051, 1050 rated
  • IAMPO Classified Marking

Mini-Vent - will vent up to 24 DFUs on stack - view Mini-Vent dimensions Price & Quantity
Mini-Vent® for 1 1/2" or 2" pipe - each $29.20
Mini-Vent® for 1 1/2" and 2" pipe - with protective cover $31.18
 
Maxi-Vent - will vent up to 500 DFUs on a stack - view Maxi-Vent dimensions Price & Quantity
Maxi-Vent® for 3" or 4" pipe (vent stack) - each
- includes insulating cover and 4" push-fit connector
$41.57
3" No-Hub Coupling needed for use on a 3"pipe $5.74

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STUDOR® Maxi-CAP for Maxi-Vents shown above
STUDOR Maxi-Cap The Aluminum STUDOR® MAXI-CAP is specifically designed to protect MAXI-VENTS® from damaging UV rays and temperature extremes when installed outdoors. This aluminum Maxi-CAP fits on top of the insulating cover included with the Maxi-Vent.

Prior to installing a Maxi-Vent, Maxi-Cap can be painted to match roof color for aesthetics.   View Maxi-CAP dimensions

Maxi-CAP UV protective cap for Maxi-Vents = $20.76

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Mini Recess Box by Studor® For Mini-Vent
Studor mini recess box and grille This mini recess box features:
  • Allows recessing of the Mini-Vent in the wall in a finished box
  • Designed for indoor use only
  • Hidden, yet accessible is servicing is ever needed
  • View dimensional drawing

Studor® Mini Recess Box with grill and screws - for Mini-Vent = $15.62

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How Studor® Air Admittance Valves Work
Studor venting Studor sealed
When a plumbing fixture is operated and water drains out of the system, negative pressure causes the valve to open, allowing air to enter as needed to equalize the pressure and protect trap seals from siphoning. When the flow stops, gravity closes the valve, preventing the escape of sewer gases through the valve.




PVC & ABS Air Admittance Valves (AAV's) by Ayrlett
  • Pressure differential sensitive valve
  • Opens when negative pressure is present in the system
  • Admits air into drain, waste & vent system
  • Closes to prevent releasing foul air inside
  • Will vent up to 20 DFUs
  • Can be used as individual, branch, circuit or stack vent
  • Reduces the number of fire-stopping applications
  • Should not be exposed to outdoor elements
  • No roof penetration if code permits
  • IPS sized
  • IPC 2003, IRC 2003, BOCA 1993, code approved
  • UPC 301.2, AM&M 2003, code approved
  • Proudly made in the USA USA flag button
Auto Vent Fits inside 2" fitting or over 1-1/2" pipe
1-1/2" Slip x 1-1/4" Female Pipe Thread
1-1/4" Male Pipe Thread
Fits inside 2" pipe or over 1-1/2" pipe
Description Price & Quantity
PVC - AAV - 2" - 1-1/2" with 2" - 1-1/2" solvent x 1-1/4" male threaded adapter $19.95
ABS - AAV - 2" - 1-1/2" with 2" - 1-1/2" solvent x 1-1/4" male threaded adapter $19.98

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Sure-Vent® Air Admittance Valves by Oatey®
Oatey sure vent
view larger image
This air admittance valve features:
  • Vacuum sensitive valve
  • Opens upon fixture discharge
  • Admits air into drain, waste and vent systems
  • Closes when pressure differential returns to zero
    and remains closed when positive pressure
    is present inside the vent system
  • No roof penetration where code allows
  • Glues into both 1-1/2" and 2" ABS (and threads into 2") - IPS
  • Handles up to 15 psi positive pressure
  • Should not be exposed to outdoor elements
  • Manufacturer recommends at least one vent stack to open air
  • Capacity of up to 20 DFUs
  • NSF Standard 14
  • ANSI/ASSE 1050, 1051
  • IAPMO classified mark
  • ASTM D2665/D2661
Description Price & Quantity
Sure-Vent® air admittance valve
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$30.29

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1-1/2"IPS Auto Trap Vent
autovents for mobile homes This auto trap vent features:
  • Replaces any secondary plumbing vent protecting the traps of kitchen sinks, bathroom basins, tubs, showers, washing machines, etc.
  • Breaks the siphoning action caused by draining water, preventing sewer gas from escaping the drain
  • Used in places where venting through the roof is not possible
  • Operates mechanically with a rubber diaphragm
  • Some call this mechanical vent a "check vent"
  • View installation examples

Description Price & Quantity
1-1/2"IPS Auto Trap Vent $3.79

Please note: this auto vent trap is not code in many areas due to the potential deterioration and deformation of the rubber seal allowing sewer gases to enter the dwelling.

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STUDOR® Maxi-Filtra
STUDOR Maxi-Filtra vent pipe filter The STUDOR® Maxi-Filtra operates as a two way vent, which filters air in both directions. Its active carbon filter is designed to eliminate bad odors produced by the plumbing drainage system.

The Maxi-Filtra is for outdoor use only, particularly for use with septic systems, but can also be installed on existing open vent pipes and in systems in which air admittance valves (AAVs) are installed.
This vent pipe filter features:
  • Can be installed vertically or horizontally
  • Outdoor use only
  • Contains a carbon filter that can last up to two years
  • Fits 3" or 4" pipe (IPS), 3" requires No-Hub coupling sold separately below
  • Not sure what size pipe you have? View our pipe size info page

Description Price & Quantity
Maxi-Filtra air vent filter for 3" or 4" pipe
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$46.66
Replacement cartridge for Maxi-Filtra Studor
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$13.02
3" No-Hub Coupling needed for use on a 3"pipe $5.74

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Ayrlett® Ayr-Filter
The Ayr-Filter is an activated carbon filter that generally helps eliminate offensive odors from building vents and septic systems. The filter is easy to install and requires no special tools, permits, or certifications.
ayr-filter activated carbon filter This vent pipe filter features:
  • This vent pipe filter is perfect for septic systems and open vents (existing or new builds)
  • UV resistant PVC housing
  • No special tools required
  • Installs in upright position only
  • Designed for outdoor use
  • Activated carbon filter cartridge lasts up to 2 years
  • Connection size: 4" spigot (requires 4" coupling to attach to 4" pipe)
  • View dimensions / specifications
  • Not sure what size pipe you have? View our pipe size info page

Description Price & Quantity
Ayr-Filter air vent filter
Order 6 or more of the same item for greater savings!
$29.97
Replacement cartridge for Ayr-Filter
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$9.87
PVC coupling - 4" (SxS) $4.34
Flexible connector for 4" pipe $12.41

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We also offer a huge selection of PVC fittings and flexible connectors.

We recommend plumbing your vents to the outside per your local codes. Using the above-mentioned vents may not be code approved in all areas. Before purchasing and installing any of these above auto-vent products please check with your local codes to determine if acceptable in your area. Please note that all brands of mechanical devices such as AAV's will ultimately fail.

Please note: While we strive to ensure every product we label as "Made in the USA" really is 100% made in the USA, it is also important to understand that sometimes manufacturers make changes to their products, or for various reasons may receive components or materials that they would normally purchase domestically from an overseas supplier - and they don't necessarily let distributors (like us!) know that they've changed something about the product or where it is manufactured.

If you receive a product that PlumbingSupply.com® says is "Made in the USA" and the product states it was manufactured elsewhere, please contact us. We will happily replace or refund your purchase to your satisfaction.

Frequently Asked Questions

Q. "I see that all of your AAV's (auto-vents) shown on this page are mounted from the top going down (vertically mounted). Can I install any of these AAV's horizontally instead?"
A. To our knowledge, all of the auto-vents (AAV's) that we offer need to be installed vertically to operate correctly and safely.

Q. "What does DFU stand for?"
A. DFU stands for Drainage Fixture Unit. Drainage fixture units are used to determine the size of piping needed for proper drainage and vent systems.

Q. "Can I use Air Admittance Valves (AAVs) only for my whole house?"
A. No, a minimum of one vent must be open to the atmosphere (outside the dwelling) to allow the release of positive pressure in the drain system to prevent possible trap blowout allowing sewer gas into the home/building. A wet vent may also be an option; however, as always, check with your local code enforcement agency to ensure that your project will comply with code in your area.

Q. "How does an Air Admittance Valve work?"
A. An Air Admittance valve is a one-way valve designed to allow air to enter the drainage system when the pressure in the plumbing system is less than the atmospheric pressure. They are designed to close when there is internal drain pressure to prevent any foul odor or gas from releasing out through the air admittance valve and entering your building.

The Air Admittance Valve must be installed a minimum of 4" higher than the trap as required by code. Installing the air admittance valve lower than 4" above the trap can cause drain waste to come in contact with the internal diaphragm. Drain waste contact with the diaphragm can cause debris to become lodged in the diaphragm preventing it from sealing properly and allowing sewer gas and foul odor into the building.

As water flow subsides in the drain the air entering the drain from the Air Admittance valve flows above the water towards the trap weir effectively stopping the water flow. This keeps the trap from being siphoned dry which would allow sewer gas and smell from entering the building. If the Air Admittance valve is installed below the trap, air would not be able to stop the siphoning action of the natural water flow and the trap would be siphoned dry.

See image below for sample diagram:
Air admittance valve diagram



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We hope that we have helped you on this page with air admittance vents, valves and auto vents,
and thank you for helping to make PlumbingSupply.com® the most famous Internet plumbing supplier.


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