How does this style of lockshield work?

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19 Dec 2017
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Hi all

How do I isolate this radiator?

I found the part online listed as "myson euro lockshield with drain off" but I can't see how you lock it

I tried turning the nut on top it's still tight but rad still receiving water

PXL_20230902_122002085.jpg

Cheers
 
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Thank you! I don't know why I couldn't find that online. All the pics just show the nut closed and the myson website is no help.

I was hesitant to remove the cap in fear of causing a flood!
 
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