Usage Tips:Solar Panel Connector Waterproof Plug 2-in-1 Plug Y Branch Compatible with MC4 Features: and Made of material, durable and practical to use Branch Connectors Conductor pin is tinned Copper: made of PPO + PA material. It makes a rock solid connection after you crimp the pin to the wire, and these are operated perfectly under heavy load This y cable are designed to complete a solar panel (PV) array, typically in parallel applications. Red to red, black to black, Better to recognize polarity. Specifications: Rated Current:20A Wateproof Degree:IP67 Rated Voltage:1000V DC Flame Class:UL94-VO Contact Resistance:≤1mmΩ Withdrawal Force:≥50N Insulation Material:PPO+PA Insertion Force:≥50N Temperature Range:-40℃-90℃ Package Includes: 1 pair Solar Branch Connectors Note: Please allow 1-3cm error due to manual measurement. please make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. thanks!