Waterproof Electrical Boxes: 3 way underground cable connector wire range for 5.5-10mm. Waterproof junction box with external terminal， which can hold the cable wire. External electrical junction box also includes 4 screws. High Quality Material: Made of high quality PC plastic, rubber washers design, moisture proof / dust proof, it will not crack or fade in sunlight, long life, high temperature. Waterproof Level: IP68 high level waterproof class, suitable for a variety of indoor and outdoor wire connections. Easy to install: The junction box can be installed under the ground easily, more convenient, simpler and safer to wire, full protection of the cable. Wide Usage: Broadly used for outdoor waterproof lightings and underwater lightings such as street lights, buried lights, garden lights, square lights, stadium lights and sea, underwater engineering, LED tunnel lights or LED Road landscape lighting, etc.