AIMTOM 6.6Ft Heavy Duty Waterproof Solar Male/Female Connector to DC 5.5mm x 2.1mm Solar Panel Adapter Cable for… Price: $16.74 (as of 14/04/2021 06:00 PST- Details)

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Universal for all solar panels with MC4 connectors; Upgraded to extra long 2m/6.6ft, which is great for conveniently positioning your solar gear; Maximum current rating 5A;
One end is female & male solar connectors; the other end is DC 5521 connector -5.5mm X 2.1mm (Outer diameter 5.5mm, inner diameter 2.1mm);