First socket in to the property is usually a master and all subsequent are secondary or slaves.
Deco Stainless Steel Telephone BT Socket with Black Insert
See more products from Electrical Accessories Switches & Sockets Brushed Chrome Sockets & Switches Stainless Steel Switches and Sockets
We also stock these products as alternatives or additions to the Stainless Steel Phone Socket - Black Insert - Single Secondary or Slave:
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