Drain point on Alpha Boiler

[Asoa]

Hi

This may seem like a daft question, so I apologise up front.

I need to change the temperature sensor on my CD20S Alpha Boiler.

The procedure seems simple enough, shut the valves, drain the boiler, replace the sensor, re fill boiler.

But, I have no idea how to get the drain point open. I am used to the old type drain cocks, i have not seen this before.

Please can someone explain how to open up the drain point

(i told you it was a daft question)

thanks

Dave

I tried to attach a pic but new posts not allowed URL's ??

 

[Dotty]

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