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					Originally Posted by  hillegom
					 
				 
				You need to stop water going to the valve. Then unscrew the large nut under the handle. There is a gland usually there that will stop the water from coming out. 
If you are lucky, its an O ring and you need to replace, otherwise, might be a proprietary rubber seal. 
First try tightening that large nut under the handle. It should be snug, don't overtighten. 
After replacing the hopefully, O ring, smear just a little silicone on the rubber. Always makes them last longer. 
			
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 Thanks for that!  I will have to see if I'm brave enough to operate on the valve..