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

♻️Replaceable carbon filter lasts 2 years

🌬️Eliminates sewer gases & odors

🛠️Fits 3- or 4-inch piping

R2443

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Description

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

DIY FRIENDLY INSTALLATION - No specialist needed—install externally wherever odors are a problem, saving time and money.
SUSTAINABLE COST EFFECTIVE - Replaceable filter cartridge with up to 2 years of life reduces maintenance frequency and costs.
UNIVERSAL FIT FOR EASY UPGRADE - Designed for 3- or 4-inch pipes, seamlessly retrofits existing septic or sewer systems without hassle.
CERTIFIED QUALITY RELIABILITY - Meets CSA, IAPMO, and ULC standards for peace of mind in performance and safety.
ODOR FREE ENVIRONMENT GUARANTEED - Active carbon filter traps and neutralizes septic tank odors before they invade your space.

The Studor 20297 Maxi-Filtra is a bi-directional active carbon filter designed to eliminate unpleasant odors from septic tanks and lift stations. Compatible with 3- or 4-inch piping, it installs externally without specialist help and features a replaceable carbon filter lasting up to two years. Certified to CSA, IAPMO, and ULC standards, it ensures a cleaner, odor-free environment while being easy to retrofit into existing plumbing systems.

Specifications

ASIN	B00FQEX1ZG
ASIN	B00FQEX1ZG
Best Sellers Rank	#82,852 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #222 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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R2443

Duties & taxes included

In stock

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

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to South Africa.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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Excellent communication throughout the order process. Product is perfect.

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