Radiator Bleed Valve 1/2" Silver Brass Silicone Seal Air Outlet For Water Additive

1/2 inch automatic bleed valve pipe threads cast iron valves heating system. Double action mechanism silicone O-ring expansion valve washer air inlet deflates water inlet leakage. central heating. G1/2 thread 27mm fan automatic bleed valve G1/2 European thread pipes. height 27 mm radiators. Control ventilation system automatic mode ventilation. open ventilation overheating. close ventilation. hot water circulation systems radiators wall boilers underfloor heating distributors heating systems. heating residential commercial buildings. pure hot water systems valve.