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Master sockets contains a surge arrestor and an R/C circuit filter these are used by your service provider to get a fixed value resistance when they run line checks. Secondary or extension telephone sockets are used to run additional points of the original master socket. Standard BT type socket with screw type terminals.
The Knightsbridge range is a simple, yet stylish collection of curved edge wiring accessories that offer a gently contoured 7mm plate and includes matching screw cap covers.