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Customers who have purchased auto vents have also been:
to air gaps - to air eliminators, Hydronic, Solar (air relief vents) - to vent pipe screens
to Odorhog™ vent pipe filters - to airgap kits - to the best selection of PVC fittings on the Internet
to many plumbing-related tools - to many water detection (flood prevention) products

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®

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 - click for dimensions	Price & Quantity
Mini-Vent® for 1 1/2" or 2" pipe - each Order quantities of 6 or 36 of the same item for greater savings!	$27.95
Mini-Vent® for 1 1/2" and 2" pipe - with protective cover Order quantities of 6 or 36 of the same item for greater savings!	$29.95

Maxi-Vent - will vent up to 500 DFUs on a stack - click for dimensions	Price & Quantity
Maxi-Vent® for 3" or 4" pipe (vent stack) - each Order quantities of 6 or 36 of the same item for greater savings!	$39.95
3" No-Hub Coupling needed for use on a 3"pipe	$4.34

Pricing discounts will be shown in the shopping cart.

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How Studor® Air Admittance Valves Work

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 siphonage. When the flow stops, gravity closes the valve, preventing the escape of sewer gases through the valve.

STUDOR® Maxi-CAP for Maxi-Vents shown above

The STUDOR® MAXI-CAP is specifically designed to protect MAXI-VENTS® from damaging UV rays and temperature extremes when installed outdoors.

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

Click here for dimensions

Description	Price & Quantity
Maxi-Cap™ UV protective cap for Maxi-Vents Order quantities of 6 or 36 of the same item for greater savings!	$19.95

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Mini Recess Box by Studor® For Mini-Vent

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

Description	Price & Quantity
Studor® Mini Recess Box with grill and screws - for Mini-Vent	$14.95

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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		← 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	$24.95
ABS - AAV - 2" - 1-1/2" with 2" - 1-1/2" solvent x 1-1/4" male threaded adapter	$24.98

Order 6 or more of the PVC or ABS AAV's for greater savings

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Sure-Vent® Air Admittance Valves by Oatey®

click here to 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 Order 6 or more of the same item for greater savings!	$30.29

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1-1/2"IPS Auto Trap Vent

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™

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? Click here for our pipe size info page

Description	Price & Quantity
Maxi-Filtra™ air vent filter for 3" or 4" pipe Order 6 or more of the same item of the same item for greater savings!	$44.95
Replacement cartridge for Maxi-Filtra Studor Order 6 or more of the same item for greater savings!	$12.49
3" No-Hub Coupling needed for use on a 3"pipe	$4.34

Pricing discounts will be shown in the shopping cart.

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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.

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)
Click here for dimensions / specifications
Not sure what size pipe you have? Click here for our pipe size info page

Description	Price & Quantity
Ayr-Filter™ air vent filter Order 6 or more of the same item for greater savings!	$31.97
Replacement cartridge for Ayr-Filter™ Order 6 or more of the same item for greater savings!	$9.87
PVC coupling - 4" (SxS)	$4.34
Flexible connector for 4" pipe	$12.41

Pricing discounts will be shown in the shopping cart.

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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.

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 for 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. The AAV must be installed higher than the trap.
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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