ECO-WORTHY 12AWG 1 Pair Solar MC4 Y Parallel Branch Connectors MFF&FMM Pair are UL Listed. Compatible with solar connector.  Used to connect multiple solar panels or groups of solar panels together in a solar field.  Load capability with big current and high voltage. Good ability of resistance and machine shocking. Eligible plastic material has marvelous performances of high low temperature, fireproof, anti-Ultraviolet rays and applied to the long-time operation outside.