Knightsbridge Telephone Master Outlet - Matt Black CL73MB

The master socket contain 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. Standard BT type socket with screw type terminals. Rounded edge metal design

• Master BT type socket
• Screw terminals
• Rounded edge design with built in gasket
• Certified to BS 5733
• Minimum mounting box depth: 25mm