This is a pair of MC4 T-branch cable connectors for solar panels and photovoltaic systems (2 male + female, 2 female + male connectors).
These connectors are typically used for linking two solar panels together but can also be used for more complex solar systems where T-junction connectors are required.
These connectors fit all Photonic Universe solar panels and most other solar panels with MC4 connectors. Please note that these connectors are not compatible with other types of MC connectors such as MC3.
The connectors are fully waterproof which means that they can be used outdoors in all weather conditions.