Features: Premium Material: made of high quality polyolefin and lined by adhesive, it is durable, elastic, nonflammable and insulated. Waterproof: it has an excellent sealing performance, giving water resistance. Sensitive Conductive: its inside body is highly pure copper tube, ensuring good conductivity. Transparent Design: This transparent connector provides wires/cable inspection when you insert cables inside. Function: the connector can perfectly connect cables and protect the cables from water or corrosion. Convenient To Use: just simple operations enable to complete wires\' welding, insulating and sealing. Use It in: it is widely used in marine, boats, automobiles, DIY, etc.