Knightsbridge Screwless Telephone Master Socket – Polished Chrome The Knightsbridge Screwless Telephone Master Socket in a premium polished chrome finish is the main point of connection between your property and the telephone network. As the primary socket, it contains a surge arrestor and R/C circuit filter, which are used by service providers to obtain a fixed resistance value when carrying out line checks. Designed with a standard BT type socket and screw-type terminals, it ensures secure and reliable installation. Featuring a screwless low-profile design with an integrated gasket, this master socket provides a sleek, modern look to complement contemporary interiors. Certified to BS 5733, it guarantees safety, compliance, and long-lasting performance. Master BT type socket for main telephone connection Screw terminals for secure and easy wiring Screwless low-profile design with integrated gasket Certified to BS 5733 for safety and compliance Minimum mounting box depth: 25mm Data Sheet: Click Here for Data Sheet