The Armstrong International C3510-8 11AV Air Vent is a stainless steel air removal valve designed for hydronic heating and HVAC water systems. It automatically releases trapped air from piping by allowing accumulated air to escape while retaining system water. Featuring 3/4-inch connections and a 400 PSI pressure rating, this vent is suitable for boilers, heating loops, and commercial... https://www.partshnc.com/c3510-8-armstrong-international-11av-34-400-air-vent-ss