ZLKSKER 4 Pin P4 CPU Power Extension Cable for Desktop Computer (8 Inch,18AWG), Connect 12V Power Supply and CPU Power Connector, 4 Pin Male and 4 Pin Female: Amazon.co.uk: Electronics & Photo
Shakmods Black Male & Female 4 Pin Molex Connector With Pins for PC Computer Power Supply : Amazon.co.uk: Computers & Accessories
All about the various PC power supply cables and connectors