This Danco Radiator Air Vent Valve features a 1-way valve that permits air to enter when negative pressures develop in the piping system. Closes by gravity to seal the vent terminal at zero differential pressure. Prevents sewer gases from escaping into a building.
- Durable brass construction
- For use as a secondary vent
- One size approved to handle up to 3″ vent pipe
- Opens/closes as needed by building’s plumbing system