We have two holes in our old concrete septic tank for vents. Will this product be the best for both? Do we need an air admittance valve either/ or?

Provided the two holes are at the top of the septic tank and they will accommodate a pipe of a diameter specified in the product description, you should not have any problem fitting the product to one or both of the vent holes. As the Studor Maxi-Filtra is a two way vent I cannot see the need for an air admittance valve. Hope this helps.

Could this be fitted horizontally, onto an existing, rectangular opening vertical pipe I wonder...?

I don't think it would as the unit is a round fitting. I don't know how you could make a tight seal all around it and your existing rectangular pipe

Would this work on a cesspit vent pipe?

Yes I think it should. We fitted ours to a vent pipe on the patio with the tanks beneath and works great!

Does this include the fittings for attachment to 100mm Vent pipe. The brochure on their website shows that fitting is possible, but is it included?

The Studor Maxi Filtra will fit 75mm, 90mm and 110mm dia pipe, fitting is included.

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🌿 Breathe Easy, Live Fresh — The Ultimate Odor Shield for Your Space

VERSATILE APPLICATION - Ideal for septic tanks, lift stations, and even some main sewer line connections—consult experts for perfect fit.
NO HASSLE INSTALLATION - External mounting with no specialist tools required—retrofit your existing plumbing with ease.
ECO FRIENDLY AIR QUALITY - Prevents harmful sewer gases from polluting your building and surroundings, promoting a healthier environment.
LONG LASTING ODOR CONTROL - Replaceable active carbon filter ensures up to 2 years of powerful odor elimination.
SEAMLESS FIT FOR YOUR SYSTEM - Compatible with standard 3- or 4-inch septic and lift station vents for effortless integration.

The Studor20297 Maxi-Filtra is a compact, easy-to-install active carbon filter designed to fit 3- or 4-inch septic and lift station vents. It effectively eliminates sewer gases and odors, improving air quality around buildings. Featuring a replaceable carbon filter with a lifespan of up to 2 years, it offers a sustainable solution to odor control without requiring specialist installation. Perfect for retrofitting existing systems or new setups, it ensures a fresher, healthier environment.

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Product Dimensions	8.89 x 8.89 x 15.24 cm; 0.28 g
Part number	20297
Material type	Acrylonitrile Butadiene Styrene Rubber
Manufacturer	IPS Corporation
Item model number	20297
ASIN	B00FQEX1ZG

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

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