These MC4 Y-Branch compatible connectors are designed to connect solar panels between solar panels and extension, which is a perfect solution for connecting multiple panels in parallel in a solar field, and is generally used in parallel applications. Features: Y-Branch MC4 solar panel cable connectors, suitable for PV system. The O-ring is perfect for sealing out water and dust to prevent corrosion. Compatible with PV cables with different insulation diameters. With excellent aging resistance and UV resistance, it can be used in harsh environment. High and low temperature resistance and flame retardant. Carrying capacity with high current and high voltage. Quick and easy installation and simple removal of the plugs without the use of any additional instrument. Great solution for parallel connection of multiple panels together in a solar field.