From Amazon
Akasa PWM Fan Splitter | 1 to 2 Ways 4-Pin PWM Fan | Speed Control PC Case Fan Splitter Extension Cable | Black Braided | 150mm 15cm | 4 Pack | AK-CBFA04-KT04
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Akasa PWM Fan Splitter Cable Braided 15cm
Conrad Electronic
Akasa PWM Lueftersplitter, 4er Pack PC fan controller Black