Telephone Master Outlet - Square Edge Brushed Chrome IP20 | Description: 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. Square edge metal design - Master BT type socket - Screw terminals - Square edge design with built in gasket - Certified to BS 5733 - Minimum mounting box depth: 25mm | Features: Finish: Brushed Chrome, Material: Premium grade steel, Height: 8.9cm, Width: 8.9cm, Projection: 1.05cm, Wattage (max) : 2.5W