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How to Turn Valve on Under Boiler?

Posted: Tue Nov 27, 2018 11:07 pm
by Puter
I've turned the valve to switch the water off to my boiler, but I can't seem to turn it back it doesn't twist, any ideas? (image attached) I'm guessing the black thing on there locks it somehow perhaps?

All help much appreciated, I'm in trouble with my girlfriend here!

Worcester Bosch greenway 30i

Pete