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RJ11 - RJ11 | 3m Lead | 4 Wire | From £3.50 | RJ11-RJ11 3m 4W | PMC Telecom
RJ11 4 Wire to UK BT Telephone Socket US Plug Adapter 6P4C 10cm Modem
4 Wire Line Cord (3 Metre - RJ11-RJ45 Plug) | 03-4420 | £4.80
BT Telephone Line Cable Adapter from RJ11 Socket Female Jack to BS6312 431A Male Plug | British UK Modular Standard Connector to 6P4C for RJ11 universal lead | 4 Wire Converter | White | Keple.com
Bt M-Rj11 F 4 Wire Cross Over Adaptor – FruityCables