The NM13/MCLA255G 13 Way Upgrade/replacement cover is designed to retrofit onto old Metal NH Consumer units measuring 255mm in height, to make them Compliant with the current 17th Edition 3rd Amendment regulations on consumer units, for use with the following Metal Consumer Units - NH1906 NHRS1906 NHRS15SSLMHI Or Any other wylex old NH Metal only consumer units measuring 435mm (17.3") in Width
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