The Tuf-Tite Sweet Air™ Vent Stack Odor Eliminator is a device that attaches to residential and commercial vent stacks to eliminate unpleasant plumbing and septic odors using activated carbon filtration. Features:Odor Elimination: Uses an 8-ounce charge of activated carbon to "scrub" and neutralize foul air and hydrogen sulfide gas before it leaves the vent stack.Easy Installation: Designed for a simple, no-tools-required push-in installation on existing vent pipes.Compatibility: Features a universal connector base that fits both 3-inch and 4-inch Schedule 40 vent stacks (can be adapted for smaller pipes with additional fittings).Durable Construction: Made from UV-stabilized, high-impact ABS plastic to resist weather-related damage and ensure a long service life.Low Maintenance: A twist-top cap provides easy access for periodic replacement of the activated carbon media.Unrestricted Airflow: The design includes vents and a chamber bottom to allow for proper and unrestricted airflow while capturing odors.