High Quality Material, Waterproof and SealedThe connector is made of heat shrink tubing and fusible solder sleeve. When heated, the high quality heat shrink tubing with a 3:1 shrink ratio shrinks to form a tight seal to prevent moisture and wire corrosion after sealing Simple applicationThe connection can be established by simply placing the bare wire into the solder joint and adjusting the temperature evenly with a heat gun.The transparent sleeve can facilitate precise visual inspection during the connection process Widely quotedThe connectors 500 welded electrics are not only suitable for electronics, railways, ships, automobiles, motorcycles, aerospace and other fields, but also other industrial and outdoor applications Color coding is easy to identify5 colors, including 50 waterproof red wire connectors, 50 blue wire connectors, 20 yellow wire connectors, 40 white wire connectors, 340 black wire connectors and 500. Different colors make it easy to identify Friendly Customer ServiceWe are committed to every seller 100 percent satisfaction. If you have any questions or product quality issues, please do not hesitate to contact us.