Simple,quick installation. With excellent aging resistance and UV endurance. Compatible with MC4 solar connector. Created seal,design of water proof and dust proof Eligible plastic material has marvelous performances of high low temperature, fireproof ,anti- Ultraviolet rays and applied to the long-time operation outside. Please visit for more details http://www.eco-worthy.com/catalog/installation-parts-c-158.html check the following link, this video will introduce how to use Y branch connectors