This is a BT style plug to socket telephone extension lead with 4 cores to extend an existing BT telephone cable. 4 way (431A).
Telephone extension cable / BT plug to socket.
BT style plug to socket telephone extension lead / phone line modem landline.
Ideal for connecting modems, telephones, fax machines, Sky boxes to a BT socket. White telephone extension lead fitted with a standard BT plug on one end and standard BT socket on the other. BT style 4 way plug (431A) plug to BT style 4 way socket (431A). telephone cable fitted with a telephone plug and coupler.