The master socket contains 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. Flawless Screwless design
- Master BT type socket
- Screw terminals
- Screwless low profile design with built-in gasket
- Certified to BS 5733
- Minimum mounting box depth: 25mm
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