RJ11 plug to UK telephone socket adapter cable - Shiny Hardware
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2250-230) - TELEPHONE DOUBLE ADAPTOR - 1 x BT + 1 X RJ11 (US) SOCKETS - Fairline Distribution Ltd
RJ11 Socket/Plug & BT Male/Female Telephone US to UK & UK to US Adapter
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Philex RJ11 Telephone & Modem Adaptor - Screwfix
Telephone Splitters, 2 Way BT Phone Socket Adapter, RJ11 BT Plug Male to 2 Female, Double Phone Socket Adaptor for UK Landline Telephone, FAX, Modem, Cable Adapter and Converter, White – Uvital
Casoter Double BT Socket Adapter, One BT Plug to Two UK BT Telephone Socket Adapter, 1 Pack : Amazon.co.uk: Electronics & Photo
Wilko Triple Telephone Adaptor | Wilko
Wilko Double Telephone Adaptor | Wilko
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Rj11 Socket to BT UK Plug Adapter Connector Telephone Cable Fax Kauden Btus2 for sale online | eBay