can it be mounted outside upside down?

I believe this would allow water to sit inside it and affect it's capability to work properly. Also, if you live in a cold climate then it could freeze.

Is this an actual air admittance valve, or simply a charcoal filter?

It's both a vent and a filter. I use it to keep rain and snow out of the venting system. The air comes out the bottom of the cap. Works fine for me.

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Studor 20297 Maxi-Filtra Septic Tank Drain Vent Two-Way Active Carbon Filter, 3- or 4-Inch Connection

Studor 20297 Maxi-Filtra Septic Tank Drain Vent Two-Way Active Carbon Filter, 3- or 4-Inch Connection

Product ID: 19712591

Details

Brand
Studor
Exterior Finish
Rubber
Inlet Connection Size
3.5 Inches
Inlet Connection Type
Slip
Item dimensions L x W x H
3.5 x 3.5 x 6
Material
Acrylonitrile

♻️Replaceable active carbon filter (2-year life)

🌬️Two-way vent for odor elimination

🛠️Fits 3- or 4-inch pipes

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Fr 157

Duties & taxes included

In stock

Sold byAmazon LiechtensteinDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌿 Breathe Easy, Live Fresh — The Ultimate Septic Vent Upgrade

DURABLE DISCREET DESIGN - Compact ABS construction fits vertically or horizontally in tight spots, blending into your outdoor setup effortlessly.
UNIVERSAL FIT ZERO HASSLE - Designed for 3- or 4-inch piping with easy slip connections—retrofit your existing system without specialist help.
DUAL DIRECTION VENTING POWER - Two-way venting filters air both ways, ensuring no foul smells escape while maintaining system pressure balance.
SEAMLESS SEPTIC ODOR DEFENSE - Active carbon filter traps and neutralizes sewer gases, keeping your outdoor spaces fresh and inviting.
ECO FRIENDLY COST EFFECTIVE - Replaceable filter lasts up to 2 years, reducing maintenance frequency and avoiding costly roof vent installations.

The Studor 20297 Maxi-Filtra is a robust two-way active carbon vent filter designed for 3- or 4-inch septic and drainage systems. It eliminates unpleasant odors by filtering sewer gases before they escape, using a replaceable carbon filter with up to 2 years of life. Its versatile ABS construction allows installation in tight or hard-to-reach outdoor locations without specialist tools, making it ideal for retrofitting existing plumbing or new builds. This vent supports system pressure equalization while preventing odor pollution, enhancing backyard enjoyment and compliance with building regulations.

Specifications

ASIN	B00FQEX1ZG
Best Sellers Rank	#150,000 in Health & Household ( See Top 100 in Health & Household ) #90 in Septic Tank Treatments
Brand Name	Studor
Connector Type	Slip
Customer Reviews	4.4 4.4 out of 5 stars (466)
Exterior Finish	Rubber
Global Trade Identification Number	00764651202977
Included Components	Instructional guide included
Inlet Connection Size	3.5 Inches
Inlet Connection Type	Slip
Item Dimensions	3.5 x 3.5 x 6 inches
Item Weight	0.01 Ounces
Manufacturer	IPS Corporation
Manufacturer Part Number	20297
Material Type	Acrylonitrile Butadiene Styrene, Rubber
Model Number	20297
Number of Ports	1
Outlet Connection Size	3.5 Inches
Outlet Connection Type	NPT
Set Name	3-inch and 4-inch
Size	3-inch, 4-inch
Thread Size	1.5 inches
Thread Type	NPT, None
UPC	764651202977
Valve Type	thermostatic

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