These 2Y connectors can fit all MC4 Type Photovoltaic Universe solar panels. It is 100% waterproof, so they can be used outdoors in any weather conditions.

MC4 Branch Connectors are 2 to 1 connectors that allow for a safe and simple parallel or serial-parallel connection of PV modules. Available in either 2 female to 1 male, or 2 male to 1 female, and pluggable with single-pole MC4 connectors

MC4 Y Branch Connectors are 2 to 1 connectors that allow for a safe and simple parallel or serial-parallel connection of PV modules. Available in either 2 female to 1 male, or 2 male to 1 female, and pluggable with single-pole MC4 connectors