DERPIPE Automatic Air Vent Valve - 1/2" NPT Male Thread Stainless Steel Exhaust Air Release Valve Bleed Air in Heating System for Boiler Radiators Solar Water Heater

["STAINLESS STEEL 304 Air Vent Valve: Exhaust Valve is made of high quality stainless steel 304. Anti-rust and high temperature resistance.","BlEED EXCESS AIR: Automatically let air out while preventing water from discharging.","WELL-SEALED AIR RELEASE VALVE: Made of high-precision parts. Can be taken apart. Convenient to demount and maintenance. Sealing o ring at the joint ensures that water will not leak.","SPECIAL STRUCTURE DESIGNED: Floating system with a spring to close the air vent valve automatically before the water reaches the top, so that only air can comes out. Bleed off air of the system over time.","WIDE APPLICATIONS: Widely used in water heating systems, HVAC systems, Radiators Boiler Solar Water Heater or other water and steam separation projects."]