MC4 Male Solarline 2 Coupler 10 / 12 Ga
MC4 Male Connector
This is the genuine Multi-Contact male connector to attach to your 10/12 Ga. USE2 UV resistant Solar Cable. This requires a special crimping tool to accomplish this properly and legally (see below).
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UPS Ground – 48 States - Latin America Pick Up Only at Solar Biz Warehouse, Bocas Panama
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I have not yet purchased anything but these folk have been nothing but amazing, from their info to their service and prices.