this air vent is designed to function in hydronic systems utilizing standard antifreeze concentrations

Featuring a 30-inch capillary tube

automatically resetting once the temperature drops back to 120

Durable Design: Engineered to withstand system pressure surges and thermal cycling inherent in industrial steam headers

Contractor Grade Durability: Equipped with a non-spring return (NSR) mechanism and a reinforced drive train for stable performance in high-cycle hydronic applications

Johnson Controls P72DA-1 Pressure Control Freon this air vent is designedTwo Pole High Pressure Control, DPST, Open High Close Low, 50 Psi to 450 Psi, Lockout ( Requires Manual Reset ) Differential, 36" Capillary with 1 4" Flare Nut, 525 Psi Max Bellows Overpressure, Includes Universal Mounting Bracket, "All Range" for R 12, R 22, R 134A, R 500 and R 502