What is this?

Discussion in 'Plumbers' Talk' started by scott1903, Sep 16, 2017.

  1. scott1903

    scott1903 New Member

    Hey

    First time on here, hello! I am planning to swap out a couple of Radiators soon and will be draining down the system. Before any work I like to understand the the system, so have been looking around and drawing up a rough schematic.

    I am pretty happy, apart from one item, the silver cylinder in the photo. It has a feed and expansision pipes, a pipe to the pump and a 4th that disappears into the wall.

    I'm guessing it's some sort of circulator/ valve but would like to understand its purpose before I continue. I am not trade, but am pretty competent I think.

    Thanks in advance
     

    Attached Files:

  2. KIAB

    KIAB Super Member

    Air seperator
     
  3. scott1903

    scott1903 New Member

    Brilliant, thank you very much!
     
  4. KIAB

    KIAB Super Member

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