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Custom MC4 extension wire, red or black RPVU (PV-Wire), with or without MC4 connectors on ends, $1.50 per foot & $5 per MC4 connector -
Rennsteig MC4 key for assembling and unlocking MC4 connectors, 690 001 (each) -
Rennsteig CSC Multi-Function tool, cut - strip - crimp 10 AWG PV-Wire & MC4 connectors, 624 006 3 1 RT