4693, Universal Coupling, 6M6 , Made by Jackson Bros H21
6M6 Universal Coupling, Part Number 4693, breakdown voltage 5KV, Capacity from side to sode (1 side earthed) 2.25pf. Fitted with M3 x 6 grub screws (4). Will permit misalignment up to 1mm. Made by Jackson Bros in the UK. New and unused.