Bewinner 4-Pin PWM Fan Hub, 4-pin Male for CPU Fan PC Fans Hub, Computer CPU/Case Fan Power Multi Splitter Connector Cable Adapter for 12V Computer 3-pin 4-pin Fans : Amazon.in: Computers &
Dell 4 Pin to 4 Pin PWM Fan Converter Sleeved Cable 20cm - MODDIY
Driving a 4-pin computer PWM fan on the BTT Octopus using Klipper – Nicholas Sherlock