SECONDARY LINE JACK LJU 3/3A

LJU 3/3A Secondary Telephone Extension Socket. Line Jack Unit 3/3A.This telephone extension ( also called secondary or slave ) socket measures the industry standard 85mm x 85mm.
It will fit any standard flush or surface mounted backbox.(the size of a single power point or light switch).
It has idc connections to the rear so you will need a terminating tool  and if you are going to surface mount you will also need a backbox.