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

Studor 20297 Maxi-Filtra Septic Tank Drain Vent

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 bi-directional odor control

🛠️Fits 3- or 4-inch piping

¥24803

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

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

BUILT TO LAST ANYWHERE - Durable ABS and rubber construction withstands outdoor conditions and fits vertical or horizontal installations.
ECO FRIENDLY COST SMART - Eliminate costly roof penetrations and reduce environmental pollution with a simple external vent solution.
UNIVERSAL FIT ZERO HASSLE - Designed for 3- or 4-inch pipes with easy slip connections—retrofit your existing system without a specialist.
DUAL DIRECTION VENTING POWER - Two-way venting ensures balanced airflow and prevents sewer gases from entering your building or environment.
ODOR FREE LIVING GUARANTEED - Advanced active carbon filter traps and neutralizes septic odors before they invade your space.

The Studor 20297 Maxi-Filtra is a robust two-way active carbon vent filter designed for 3- or 4-inch septic tank and lift station pipes. It effectively eliminates sewer odors by filtering air bi-directionally, featuring a replaceable carbon filter with up to 2 years of life. Its durable ABS and rubber build allows versatile outdoor installation without specialist help, making it an eco-friendly, cost-effective solution to maintain fresh air around drainage systems.

Specifications

ASIN	B00FQEX1ZG
Best Sellers Rank	#134,774 in Health & Household ( See Top 100 in Health & Household ) #76 in Septic Tank Treatments
Brand Name	Studor
Connector Type	Slip
Customer Reviews	4.4 4.4 out of 5 stars (477)
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 (ABS), 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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TrustScore 4.5 | 7,300+ reviews

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The product exactly matches the description. Very satisfied with my purchase.

5 days ago

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Smooth transaction and product arrived in perfect condition.

3 weeks ago

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¥24803

Duties & taxes included

In stock

Sold byAmazon JapanDelivered 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 Japan.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Anita G.

Good experience, but the tracking updates could be better.

2 months ago

Yusuf A.

Fantastic experience overall. Will recommend to friends and family.

1 month ago

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