Secondary is usually used for all sockets after the master
Master is usually used for the 1st socket in the property, all others thereafter are secondary or slaves.
Round Matte Black BT Telephone Socket
See more products from Electrical Accessories Switches & Sockets Matt Black Sockets & Switches 8mm Round Matt Black Sockets & Switches
We also stock these products as alternatives or additions to the Matt Black Phone Socket - Master:
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