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

Product ID: 253782408

Details

Brand
Studor
Exterior finish
Rubber
Inlet connection size
3.5 Inches
Item dimensions L x W x H
8.9 x 8.9 x
Material
Acrylonitrile

🌿Active carbon filter removes odors

♻️Replaceable filter lasts up to 2 years

🛠️Fits 3- or 4-inch piping

R1994

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌬️ Breathe easy, live fresher—ditch the stink with Maxi-Filtra!

UNIVERSAL FIT - Compatible with 3- or 4-inch septic and lift station pipes for versatile installation
ODOR FREE LIVING - Eliminates sewer gases to keep your space fresh and pollution-free
EFFORTLESS UPGRADE - Retrofit existing plumbing without specialist help—DIY friendly
EXTERNAL INSTALLATION - Mount anywhere odors arise without disrupting your building’s interior
SUSTAINABLE FRESHNESS - Replaceable carbon filter ensures up to 2 years of continuous odor control

The Studor 20297 Maxi-Filtra is a bi-directional active carbon filter designed for 3- or 4-inch septic tank and lift station vents. It effectively eliminates sewer odors, preventing harmful gases from entering buildings and polluting surroundings. Easy to install externally with no specialist tools required, it features a replaceable carbon filter lasting up to 2 years, making it a sustainable and practical solution for odor control in residential and commercial plumbing systems.

Specifications

ASIN	B00FQEX1ZG
ASIN	B00FQEX1ZG
Best Sellers Rank	#83,596 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #224 in Registers, Grilles & Vents
Brand Name	Studor
Connector Type	Slip
Country of Publication	China
Country of origin	China
Customer Reviews	4.4 4.4 out of 5 stars (472)
Customer reviews	4.4 4.4 out of 5 stars (472)
Date First Available	1 January 2024
Exterior Finish	Rubber
Global Trade Identification Number	00764651202977
Included Components	Instructional guide included
Inlet Connection Size	3.5 Inches
Inlet Connection Type	Threaded
Is Discontinued By Manufacturer	No
Item Dimensions	8.9 x 8.9 x 15.2 centimeters
Item Weight	0.01 Ounces
Item model number	20297
Manufacturer	IPS Corporation
Manufacturer	IPS Corporation
Manufacturer Part Number	20297
Material Type	Acrylonitrile Butadiene Styrene Rubber
Model Number	20297
Number of Items	1
Number of Packs	1
Number of Ports	1
Outlet Connection Size	4 Inches
Outlet Connection Type	Barb
Product Dimensions	8.89 x 8.89 x 15.24 cm; 0.28 g
Set Name	Maxi-Filtra
Size	3-inch, 4-inch
Specification Met	CSA, IAPMO, ULC
Thread Size	1.5 inches
Thread Type	NPT
UPC	764651202977
Valve Type	Bi-Directional Active Carbon Filter Valve

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