Air Admittance Valves (AAVs) are one-way venting devices used in plumbing and drainage systems. They allow air to enter the drainage system when negative pressure is created, such as during water discharge from sinks, baths, or other fixtures, while preventing the escape of sewer gases and foul odours into the building. AAVs provide an efficient alternative to traditional vent stacks, helping to simplify plumbing layouts and reduce roof penetrations.

Drainage Filters / Odour Control Units are devices that incorporate carbon or mechanical filters to remove unpleasant odours from venting systems. These are particularly useful in areas where conventional venting is difficult or where air quality and hygiene are critical, such as kitchens, food processing units, hospitals, or commercial facilities.