Sufficient quantity: you will receive 6 pieces of automatic radiator bleeders, enough for you to use and replace, which can save your time and effort, ideal for a house with many radiators and for installing radiators with 1/2 inch (15 mm) bleed plugs; Manual bleeding is also possible Long-term use: The radiator bleed valve is mainly made of brass, sturdy and reliable, solid and firm, not easy to break, deform or rust, the gaskets are made of silicone, easy to use for a long time Temperature and pressure resistance: The maximum working temperature of our radiator self-bleed valve is 100 degrees centigrade and the maximum working pressure is 10 bar, adopting an automatic non-return function, so you can replace the valve core during operation, convenient and practical Self-sealing design: The automatic radiator air valve is designed with a self-sealing O-ring thread, and automatic venting works by using the source discs, if they enter into contact with water, they seal the spring discs,