Features: Efficiently release trapped air in radiators with this 5 pack brass air vent , enhancing heat circulation and optimizing heating systems performances through improved water flows efficiency. Crafted from nickel plated brass and heat resistant plastic, these strong radiator adapter withstand high pressure environments while featuring standard fittings for tool easy installation and smooth rotating control. Ideal for homeowners, HVAC technicians, and facility managers seeking stable heating maintenance solution in residential apartments, commercial buildings, or renovation projects. Perfect for central heating systems, water based radiators, and underfloor heating installations where consistent thermal output and easy air purge functionality are critical. The rotating knob design enables precise airflows adjustment across multiple radiator types, ensuring compatibility with wall mounted units, baseboard heaters, and hydronic heating configurations. Specifications: Component : nickel plated brass Size: about 18.5x20.5x24mm/0.73x0.81x0.95inch Package Includes: 5xAir Vent adapter note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.