The DC5521 to 4Pin adapter ensures seamless compatibility with various 55x21mm DC5521 fan and delivers stable power through its 4Pin for reliabled PC cooling and projects. Featuring premium PVC coated wiring and corrosive resistant metal contacts, this connector minimizes electrical interferences. Designed for PC builders, electronics enthusiasts, and hobbyists needing flexible fan connectivity for cooling or equipment modifications. Essential for upgrading computer case airflows, cooling printers, maintaining aquarium temperature stability, or powering industrial ventilation devices. Package includes: 1PC DC5521 to Computer Fan Power Cord