Erm....with a spanner. Seriously though....if its the one at the front of the block, remove cables then remove valve. bit of coolant will come out when you do it.
 
I’m trying to turn this anti-clockwise with a spanner. Is this wrong?
B093E546-638E-49E0-A6FC-0B857B200766.jpeg
 
Erm....with a spanner. Seriously though....if its the one at the front of the block, remove cables then remove valve. bit of coolant will come out when you do it.
Thanks for the help; it isn’t behind the block and I’ve already disconnected hoses and cables
 

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