This is a pair of female EC3 style connectors from ProTek R/C. The female connector is normally connected to the battery or other power source.
ProTek RC EC3 Style Device Connector (2 Male) (PTK-5020)
$3.99
ProTek RC EC5 Connectors Unassembled (2 Female) (PTK-5052)
$7.99
ProTek RC EC3 Style Battery Connector (2 Female) (PTK-5021)
$3.99
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