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Automatic Bottle Air Vent


An Automatic Bottle Vent is designed to discharge air from and admit air into a water pipe system. They are commonly used on central heating systems to overcome the problem of air lock. They should be at the top of a short section of pipe at any high point in the pipework of the system.


The automatic air vent consists of a float connected to a valve. As the air exceeds a given level inside the float chamber the float drops opening the valve and releasing the air trapped within the chamber. When the air is released it is replaced by water which in turn moves the float back into the up position sealing the valve.


  • Forged Brass Body
  • Corrosion Resistant Plastic Float
  • Threaded or Compression Connection
  • Quick Release Isolation Valves available on request
  • Models Suitable for Solar Applications available on request.

Technical Data:


Material: Brass
Sizes: ½” BSP Conforms to ISO228 (BS2779)
  ½” IR Compression Conforms to EN 1254-2
Max. Pressure: 10 bar 
Max. Venting Pressure: 4 bar 
Max. Temperature: 85°C