The DISCALAIR is a high performance automatic air vent that is capable of releasing large amounts of air from hydronic systems. The venting mechanism is the same proven design that is used in Caleffi's 551 series air separators, providing years of reliable service. Technical specification Connections: 1/2" NPT female Materials: - Body brass Float PP Stem brass Seals EPDM Suitable fluids: water, glycol solution Max percentage of glycol: 50% Max working pressure: 150 psi (10 bar) Max discharge pressure: 150 psi (10 bar) Temperature range: 32÷250°F (0÷120°C)