Sufficient Quantity: You will receive 6 automatic radiator air vents, enough for installation and replacement—saving time and effort. Ideal for homes with multiple radiators and compatible with 1/2-inch (15 mm) vent plugs. Manual bleeding is also possible. Long-Term Use: The radiator air vent valve is made primarily of brass—durable, reliable, sturdy, and resistant to breakage, deformation, and rust. Seals are made of silicone for long-lasting performance. Temperature and Pressure Range: Maximum operating temperature is 100°C; maximum operating pressure is 10 bar. Features an automatic anti-backflow function, allowing core replacement during operation for added convenience. Self-Sealing Design: The automatic radiator air valve features a self-sealing threaded connection with an O-ring seal. Automatic venting operates via spring-loaded discs: discs seal automatically upon contact with water and open to release air when dry. Note: This valve is intended for use with plain water only—no additives. Automatic Venting: The radiator air vent automatically releases trapped air through spring-loaded discs. It also supports quick manual venting. The self-sealing thread and integrated elastic return design ensure air is released only when dry and stop immediately upon contact with water. Suitable for water-based heating systems including radiators, boilers, and underfloor heating manifolds.