Renogy 10 10A MC4 Waterproof in-Line Holder w/Fuse, Black Compatible with PV cables with different insulation diameters. Designed for a wide range of DC applications. Auto-lock equipment of male and female points render connections easy and reliable. Waterproof - IP67 Class Protection and high current-carrying capacity. Connector adopts touch and insertion of reed with inner-knob type. Waterproof - IP67 Class Protection. Insulation material PPO. High current-carrying capacity Protection Class II Connector adopts touch and insertion of reed with inner-knob type