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Replacement Contract Head for Myson TRV 2-way Thermostatic Radiator Valve Head only supplied - valve body is NOT included The Metal ring at the base of the head has a 30mm thread Myson did make a TRV 2-Way thermostatic radiator valve body with a 28mm thread at one stage - if your valve has a 28mm thread Myson do make an adaptor to allow the head in this listing to fit on to the 28mm valve body. We have these listed in a separate listing (search for 'Myson Adaptor for TRV 2-Way Thermostatic Radiator Valve Head 28mm to 30 mm') See 5th photograph for instructions on how to fit the head to the valve, and an explanation of what the 2 metal pins are for and how to fit them